From the opera MARTHA by Friedrich Von Flotow, first performed in 1847
Used in films on Class Act:
Rosalie (sung by Nelson Eddy), 1937
This Time for Keeps (sung by Lauritz Melchior; traditional and swing versions by Johnnie Johnston), 1947
The Toast of New Orleans (sung by Mario Lanza), 1950
The Great Caruso (sung by Mario Lanza), 1951
The Seven Hills of Rome (sung by Mario Lanza), 1958

Words by Howard Johnson, music by Theodore Morse, 1915
Popularized by Henry Burr
Mother Wore Tights (exceprt sung by Chorus), 1947

Written by John A. Stromberg and Edgar Smith, 1900
Lillian Russell (sung by Alice Faye), 1940
The Jolson Story (sung by Al Jolson dubbing for Larry Parks), 1946
Jolson Sings Again (sung by Al Jolson dubbing for Larry Parks), 1949

Words by Sidney Clare, music by Con Conrad, 1921
Introduced by Eddie Cantor in the stage revue "The Midnight Rounders of 1921"
Popularized by Eddie Cantor
The Eddie Cantor Story (sung by Eddie Cantor dubbing for Keefe Brasselle), 1953

Written by Carmen Lombardo and John Jacob Loeb, 1941
Private Buckaroo (sung by Dick Foran with Harry James and His Music Makers), 1942

Written by Al Hoffman, Mann Curtis, Jerry Livingston and C. Corbin
Stage Door Canteen (sung by Gracie Fields), 1943

Words by Barbara Gordon, music by Mischa Spoliansky, 1951
Happy Go Lovely (sung by Joan Heal, danced Vera-Ellen, principal dancers and Chorus), 1951

Words and music by Cole Porter, 1948
The Pirate (sung by Judy Garland and danced by Judy with Mens Chorus), 1948

Words by Josephine V. Rowe, music by Dermot MacMurrough, 1910
Popularized by John McCormack
Hawaii Calls (sung by Bobby Breen with Raymond Paige and His Orchestra), 1938

From the opera LUCIA DI LAMMERMOOR by Gaetano Donizetti
See: Spargi d'Amaro Pianto

Opera by Giacomo Puccini, first performed in Milan, 1904

Arias and excerpts in films on Class Act:
Un bel di, vedremo
Viene la sera

Films on Class Act:
Broadway Serenade (Jeanette MacDonald), 1939
First Love (Deanna Durbin), 1939
The Great Ziegfeld (unidentified singer, 1936)
Interrupted Melody (Eileen Farrell dubbing for Eleanor Parker), 1955
The Sun Comes Up (Jeanette MacDonald), 1949
The Toast of New Orleans (Mario Lanza and Kathryn Grayson), 1950
Victor / Victoria (sung by Elizabeth Vaughan), 1982

Written by Ralph Freed, Burton Lane and Lew Brown, 1943
Du Barry Was a Lady (sung by Red Skelton singing to Lucille Ball), 1943

Sources vary on the authorship of this song. I think it's safe to say "unknown"
For Me and My Gal (part of medley sung by the MGM Studio Chorus), 1942
The Dolly Sisters (sung by Mens Chorus), 1945
Rich, Young and Pretty (played by string quartet, sung by Wendell Corey, Jane Powell and Ensemble), 1951
The Trouble with Girls (sung by Mens Chorus), 1969

Words and music by Guy Hemric and Jerry Styner, ~1965
How to Stuff a Wild Bikini (sung by Mickey Rooney and the Ad Men), 1965

Words and music by John Farrar, 1980
Xanadu (sung by Olivia Newton-John), 1980
Popularized by Olivia Newton-John (No. 1 chart record)

Te quiero dijiste
Tomando mis manos
Entre tus manitas
De blanco marfil
Y sentí en mi pecho
Un fuerte latido
Después un suspiro
Y luego el chasquido
De un beso febril...

Words (English) by Charles Pasquale, music by Maria Grever, 1930
Bathing Beauty (sung by Carlos Ramirez with Xavier Cugat and His Orchestra), 1944
Nancy Goes to Rio (sung by Jane Powell, reprised by Ann Sothern), 1949

Words by Leo Robin, music by Harry Warren, 1952
Just for You (sung by Jane Wyman and Chorus, danced by Daniel Nagrin, Miriam Pandor, Florence Lessing and Chorus), 1952

Words and music by Cole Porter
Can-Can (sung and danced by Juliet Prowse and Girls Chorus), 1960

Words and music by Fred Karger, Ben Weisman and Sid Wayne, 1965
When the Boys Meet the Girls (sung by Connie Francis), 1965

Words by Betty Comden and Adolph Green, music by Roger Edens, 1949
On the Town (sung by Gene Kelly, danced by Gene Kelly and Vera-Ellen), 1949

Music by Oscar Straus, Lyrics by Louis Alter and Paul F. Webster, 1937
Make a Wish (sung by Basil Rathbone then by Bobby Breen), 1937

Words by Oscar Hammerstein II, music by Jerome Kern, 1927
Introduced in the stage musical "Show Boat," 1927
Show Boat (sung by Allan Jones and Irene Dunne), 1936
Till the Clouds Roll By (sung by Kathryn Grayson and Tony Martin), 1946
Show Boat (sung by Kathryn Grayson and Howard Keel), 1951

Written by Arthur Freed and Nacio Herb Brown, 1952
(notice similarity to "Be a Clown" by Cole Porter)
Singin' in the Rain (sung and danced by Donald O'Connor), 1952

Words and music by Cole Porter, 1940
Introduced by Ethel Merman in the stage musical "Panama Hattie," 1940
Panama Hattie (sung by Ann Sothern), 1942

Words by Ira Gershwin, music by Jerome Kern, 1944
Cover Girl (sung and danced by Phil Silvers, Gene Kelly and Rita Hayworth; Martha Mears dubbing for Rita Hayworth), 1944

Words by Gus Kahn, music by Walter Donaldson, 1928
A bit of a spoof on the song "Makin' Whoopee"
Introduced in the stage musical "Whoopee!" 1928
Whoopee! (sung by Eddie Cantor), 1930

Words by Gus Kahn, music by Walter Donaldson, 1928
Introduced by Eddie Cantor in the stage musical "Whoopee!" 1928
Popularized by Eddie Cantor
Whoopee! (sung by Eddie Cantor), 1930
Show Business (sung by Eddie Cantor), 1944
I'll See You in My Dreams (with special lyric, sung by Danny Thomas and Doris Day), 1951
The Eddie Cantor Story (sung by Eddie Cantor dubbing for Keefe Brasselle), 1953

Words and music by Sylvia Fine, ~1956
The Court Jester (sung, danced and clowned by Danny Kaye), 1956

Words and music by Mack Gordon and Harry Owens
Song of the Islands (sung by Betty Grable, Hilo Hattie, Thomas Mitchell and George Barbier), 1942

Words and music by Charles O'Curran and Dudley Brooks
Girls! Girls! Girls! (sung by The Four Amigos), 1962

Words and music by Jararaca Paiva and Vincente Paiva, 1940
Down Argentine Way (sung and danced by Carmen Miranda with the Carmen Miranda Band), 1940
The Big Store (played on piano by Chico and Harpo Marx), 1941
Babes on Broadway (sung and danced by Mickey Rooney impersonating Carmen Miranda), 1941
Scared Stiff (sung and danced by Jerry Lewis impersonating Carmen Miranda), 1953

Words by Leo Robin, music by Ralph Rainger, 1938
The Big Broadcast of 1938 (sung by Martha Raye while being tossed around by sailors), 1938

See Mama, Eu Quero

Words and music by Jerry Herman, 1966
Introduced in the stage musical "Mame", 1966
Mame (production number sung and danced by Robert Preston and Chorus, segment danced by Robert Preston and Lucille Ball, segment danced by Lucille Ball and Chorus), 1974

Words by Ferdinando Russo, music by Emanuele Nutile
Used in films on Class Act:
That Midnight Kiss (sung by Mario Lanza), 1949

Written by Al Dubin and Harry Warren, 1935
Go into Your Dance (sung by Al Jolson), 1935

Words by William Tracey, music by Maceo Pinkard, 1919
Sensations of 1945 (sung by Sophie Tucker), 1944

Words and music by Jay Livingston and Ray Evans, ~1954
Red Garters (sung by Rosemary Clooney and Guy Mitchell), 1954

Words and music by Irving Berlin, 1949
There's No Business Like Show Business (sung and danced by Donald O'Connor), 1954

Words by Ira Gershwin, music by George Gershwin, 1924
Originally written for the stage musical "Lady Be Good," 1924, but not used
Used as "The Girl I Love" in the stage musical "Strike Up the Band," 1927
Popularized by The Berkeley Square Orchestra in London
Later popularized by Helen Morgan
Rhapsody in Blue (sung in French and English by Hazel Scott), 1945
The Helen Morgan Story (sung by Gogi Grant dubbing for Ann Blyth), 1957
Lady Sings the Blues (sung by Diana Ross), 1972

Words and music by Jerry Herman, 1966
Introduced in the stage musical "Mame", 1966
Mame (sung by Beatrice Arthur, danced by Chorus), 1974

Words by Joe Darion, music by Mitch Leigh, 1965
Introduced in the stage musical "Man of La Mancha," 1965
Man of La Mancha (James Coco and Simon Gilbert dubbing for Peter O'Toole), 1972

Words by Ira Gershwin, music by Harold Arlen, 1954
A Star Is Born (sung by Judy Garland), 1954
Nominated for Best Song Academy Award for 1954

(variation on "I'm the Guy Who Found the Lost Chord," 1946)
Words and music by Jimmy Durante
This Time for Keeps (performed by Jimmy Durante), 1947

Words and music by George M. Cohan
Yankee Doodle Dandy (part of medley sung by Frances Langford), 1942

Words by Mack Gordon, music by Harry Warren, 1941
Week-End in Havana (sung by unidentified male singer), 1941

Words by Michael Korie, music by Stephen Lawrence, 1987
Red Riding Hood (sung by Craig T. Nelson), 1987

Words and music by Richard M. Sherman and Robert B. Sherman, 1973
Tom Sawyer (sung by Warren Oates, Johnny Whitaker and Jeff East), 1973

Words by Gerome Ragni and James Rado, music by Galt MacDermot, 1967
Introduced in the stage musical "Hair" by James Rado, 1967
Hair (sung by Treat Williams [onscreen], John Savage and Chorus; danced by Ensemble), 1979

Words and music by Irving Berlin, 1919
Introduced in the Ziegfeld Follies of 1919
Popularized by Van and Schenck
Kid Millions (sung by Eddie Cantor, Ethel Merman, Ann Sothern, George Murphy, Harold Nicholas and The Goldwyn Girls; danced by the Nicholas Brothers, Eddie Cantor and The Goldwyn Girls), 1934
This Is the Army (sung and danced by Cpl. Ralph Magelssen and Chorus), 1943
White Christmas (part of Minstrel production number with Bing Crosby, Danny Kaye, Rosemary Clooney, Vera-Ellen and Chorus), 1954

Words by Lorenz Hart, music by Richard Rodgers, 1925
Introduced by Sterling Holloway and June Cochran in the stage revue "The Garrick Gaieties," 1925
Popularized by Ben Selvin and His Orchestra
Words and Music (sung by Mickey Rooney, Tom Drake and Marshall Thompson), 1949
Two Tickets to Broadway (sung by Tony Martin, Janet Leigh and Chorus), 1951
Don't Bother to Knock (sung by Anne Bancroft), 1952
The Eddy Duchin Story (played by Orchestra behind titles; later danced by Ty Power and Victoria Shaw to a Duchin recording played on Victrola), 1956
Beau James (sung by Bob Hope and Vera Miles), 1957

Words by Ira Gershwin, music by Harry Warren, 1948
The Barkleys of Broadway (danced by Fred Astaire and Ginger Rogers), 1949

Words and music by Doug Cotler and Richard Gilbert
Flashdance (sung by Karen Kamon), 1983

Words and music by Michael Sembello and Dennis Matkosky, 1983
Flashdance (sung by Michael Sembello), 1983

Opera by Jules Massenet, first performed in Paris, 1884

Arias and excerpts in films on Class Act:
Obéissons quand leur voix appelle

Films on Class Act:
Luxury Liner (Jane Powell), 1948

Words by Oscar Hammerstein II, music by Richard Rodgers, 1943
Introduced in the stage musical "Oklahoma!" 1943
Oklahoma! (sung by Shirley Jones and Girls Chorus), 1955

Words by Betty Comden and Adolph Green, music by André Previn, 1955
It's Always Fair Weather (sung by Mens Chorus, Gene Kelly, Dan Dailey and Jud Conlin dubbing for Michael Kidd), 1955

Music by Cole Porter, 1941
You'll Never Get Rich (instrumental danced by Fred Astaire), 1941

Words by Johnny Mercer, music by Harry Warren, 1945
The Harvey Girls (Judy Garland, Joe Karnes, Frank Laine, Don Ellis, Eugene Dorian, Ralph Blane, Don Williams and the MGM Studio Chorus; cut from the film), 1946
Recorded for Decca Records by Judy Garland, Kenny Baker and Kay Thompson, 1945

Words by Clifford Grey, music by Victor Schertzinger, ~1929
Love Parade (sung by Jeanette MacDonald and Chorus), 1929

Music by Richard Rodgers, 1951
Introduced in the stage musical "The King and I," 1951
The King and I (played by Orchestra), 1956

Music by George Bruns, 1961
Adapted from the music of Victor Herbert, 1903
Babes in Toyland (instrumental played by Orchestra), 1961

Words by Mack Gordon, music by Harry Revel, ~1938
My Lucky Star (sung by Mixed Chorus), 1938

Based on "Das Lied der Deutschen" (aka "Das Deutschlandlied," aka "Deutschland ueber Alles"), the German National Anthem, written in 1841; lyric by Heinrich Hoffmann von Fallersleben, based on the String Quartet in C major (the Kaiser-Quartet), Op. 76,3 of Joseph Haydn, 1797
Special lyric by Belford Hendricks, 1943
Stage Door Canteen (sung by Ethel Merman), 1943

Words and music by Roger Edens, 1957
Funny Face (sung in French by unidentified singer), 1957

Words by Benny Davis, music by Con Conrad and J. Russel Robinson, 1920
Introduced by The Original Dixieland Jazz Band
Popularized by Eddie Cantor
The Eddie Cantor Story (Eddie Cantor dubbing for Keefe Brasselle), 1953

Words and music by Don Robertson, ~1963
Fun in Acapulco (sung by Elvis Presley with Mariachi Band), 1963

Words by Oscar Hammerstein II, music by Richard Rodgers, 1959
Introduced in the stage musical "The Sound of Music," 1959
The Sound of Music (sung by Nuns), 1965

Words by Stephen Sondheim, music by Leonard Bernstein, 1957
Introduced in the stage musical "West Side Story," 1957
Popularized by Johnny Mathis
West Side Story (Richard Beymer), 1961

See Ah! Marie

Dance number staged by Albertina Rasch, 1938
The Girl of the Golden West (production number sung by Chorus, Jeanette MacDonald and Nelson Eddy and danced by Ensemble), 1938

Words and music by Meredith Willson, 1957
Introduced in the stage musical "The Music Man," 1957
The Music Man (sung by Robert Preston), 1962

Words by Oscar Hammerstein II, music by Sigmund Romberg, 1927
Introduced in the stage operetta "The New Moon," 1927
New Moon (sung by Nelson Eddy, Jeanette MacDonald and Chorus), 1940

Words and music by Irving Berlin, 1928
Popularized by Rudy Vallee
Recorded by Tommy Dorsey and His Orchestra, vocal by Jack Leonard, 1937
The Fabulous Dorseys (Stuart Foster and Janet Blair with Tommy Dorsey and His Orchestra), 1947
There's No Business Like Show Business (excerpt sung and danced by male trio), 1954
Recorded by The Bachelors, 1965

Words by Henry C. Davis, 1919
(based on a melody by Jacques Offenbach)
Stage Door Canteen (sung by Marines in canteen), 1943
Interrupted Melody (part of medley sung by Eileen Farrell dubbing for Eleanor Parker), 1955

Opera by Wolfgang Amadeus Mozart, first performed in Vienna, 1786

Arias and excerpts in films on Class Act:
Non più andrai
Voi Che Sapete

Used in films on Class Act:
Interrupted Melody (sung by Eleanor Parker), 1955
So This Is Love (sung by Kathryn Grayson), 1953

Words and music by Irving Berlin, 1951
Call Me Madam (sung by George Sanders), 1953

Written by Moises Simons and L. Wolfe Gilbert, 1931
The Big Broadcast (sung by Arthur Tracy), 1932
Theme song of Arthur Tracy ("The Street Singer")

Opera by Friedrich Von Flotow, first performed in Vienna, 1847

Arias, excerpts and songs used in films on Class Act:
Ah! che a voi perdoni Iddio
The Last Rose of Summer (not composed by Flotow, but used in the Opera)
M'Appari to t'amore

Excerpts used in films on Class Act:
A Damsel in Distress (sung by Mario Berini dubbing for Reginald Gardiner), 1937
The Great Caruso (sung by Mario Lanza), 1951
Maytime (sung by Jeanette MacDonald), 1937
Phantom of the Opera (Act III excerpts sung by Nelson Eddy, Sally Sweetland dubbing for Jane Farrar, Susanna Foster and Ensemble), 1943
Rosalie (sung by Nelson Eddy), 1937
The Seven Hills of Rome (sung by Mario Lanza), 1958
This Time for Keeps (sung by Lauritz Melchior, Johnnie Johnston), 1947
Three Smart Girls Grow Up (sung by Deanna Durbin), 1939
The Toast of New Orleans (sung by Mario Lanza), 1950

Words by Mel Leven, music by George Bruns, 1961
Babes in Toyland (short intro sung by Chorus), 1961

Words by Joe Goodwin, music by Gus Edwards, 1929
Hollywood Revue of 1929 (sung by Marie Dressler, Polly Moran and Bessie Love), 1929

Written by Sam Coslow, Leo Robin and Newell Chase, 1930
The Vagabond King (sung by Chorus), 1930

Words and music by George M. Cohan, 1905
Introduced by George M. Cohan in the stage musical "Forty-Five Minutes from Broadway," 1906
Babes on Broadway (performed by Judy Garland as Fay Templeton with off-screen Chorus), 1941
Yankee Doodle Dandy (spoken by James Cagney, later sung by Irene Manning, reprised by Sally Sweetland dubbing for Joan Leslie), 1942
The Seven Little Foys (danced by James Cagney and Bob Hope), 1955

Words by Mack Gordon, music by Harry Warren, 1940
Young People (sung and danced by Jack Oakie and Charlotte Greenwood), 1940

Words by Sheldon Harnick, music by Jerry Bock, 1964
Introduced in the stage musical "Fiddler on the Roof," 1964
Fiddler on the Roof (performed by Rosalind Harris, Michele Marsh and Neva Small), 1971

Words and music by Ruggiero Leoncavallo
The Great Caruso (sung by Mario Lanza), 1951

Words by Adrian Ross, music by Franz Lehar, 1907
Introduced in the stage operetta "The Merry Widow," Vienna, 1905
English lyric for the 1934 MGM version by Lorenz Hart
The Merry Widow (sung by Maurice Chevalier), 1934
The Merry Widow (sung by Fernando Lamas), 1952

Written by John Lennon and Paul McCartney, 1969
Popularized by The Beatles
Sgt. Pepper's Lonely Hearts Club Band (sung by Steve Martin), 1978