Approved | | Animation, Family, Short
Franz Liszt's 2nd Hungarian Rhapsody music was first used in 1941's Rhapsody in Rivets (1941) 5 to 6 years before the Warner Bros versus MGM of Rhapsody Rabbit (1946) & The Cat Concerto (1947).
Eh, what's up, Doc? Who...? Franz Liszt? Never heard of him... Wrong number.
The foot pedals of Bugs Bunny's concert grand piano appear in different configurations throughout the short - a visual gaffe that, in a narrative sense, doesn't really matter because Bugs never uses the pedals. Director Friz Freleng took plenty of liberties with real piano playing just to get the gags over.