Several Goofy appearances/shorts often features him singing the first few bars of "Oh the World Owes Me A Livin' ", which was first used in 1934's Silly Symphony "The Grasshopper and the Ants" as well as Shirley Temple's film in the same year, Now and Forever.
"Pluto's Blue Note" features him lip-synching to Bing Crosby's cover of "You Belong To My Heart", which was originally in The Three Caballeros.
And of course, the "Disneyland" television show always opened with "When You Wish Upon A Star".
I'm sure there's more, though I can't really think of them off-hand.
albert
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WIST #60:
AwallaceUNC: Would you prefer Substi-Blu-tiary Locomotion?

WIST #61:
TheSequelOfDisney: Damn, did Lin-Manuel Miranda go and murder all your families?