in
When Johnny Comes Marching Home, 1943 Jones starred in many film musicals during the 1930s and 1940s. The best-known of these were
Show Boat (1936) and
The Firefly (1937), where he first performed what became his signature song: "The Donkey Serenade". Jones is probably best remembered today as the romantic lead opposite
Kitty Carlisle and
Maureen O'Sullivan respectively, in the first two MGM films of the Marx Brothers,
A Night at the Opera (1935) and
A Day at the Races (1937), filling the straight-man role opened by the departure of
Zeppo Marx from the team. Jones made a brief appearance in the 1936 Nelson Eddy–
Jeanette MacDonald film
Rose Marie, singing music from
Charles Gounod's
Romeo et Juliette and
Giacomo Puccini's
Tosca. According to
Merchant of Dreams,
Charles Higham's biography of
Louis B. Mayer, Eddy, who apparently considered Jones a rival and a potential threat, asked that most of the footage of Jones in
Rose Marie be cut, including his rendition of the tenor aria
E lucevan le stelle from
Tosca and MGM agreed to Eddy's demands. In his final film for MGM,
Everybody Sing (1938) with
Judy Garland and
Fanny Brice, Jones introduced the pop standard "
The One I Love". "My Love For Yours" 1939. In 1940, Jones starred in two musicals for
Universal Pictures:
The Boys from Syracuse, with the stage score by
Rodgers and Hart, and
One Night in the Tropics with a score by
Jerome Kern and
Dorothy Fields, which was also the screen debut of
Abbott and Costello. After these two films, Jones slipped to leads in several "B" musicals, at
Paramount and Universal, including a reunion with his
A Night at the Opera co-star Kitty Carlisle in
Larceny with Music (1943). The same year, he made a guest appearance, as himself, in the
Olsen and Johnson musical
Crazy House, where he again performed "The Donkey Serenade". ==Recordings==