Singing voices
At least one source claimed that Sterling Holloway (a.k.a. "Winnie the Pooh", "Kaa", "Roquefort", etc.) also did the singing voice for Jock the Scottish terrier (when we first see him burying bones). However, if you ask me, the singing sounds an awful lot like Bill Thompson (who ALSO did Jock's speaking voice).
Also of interest, did George Givot and/or Bill Thompson (again) do their own singing as Tony and Joe during the "Bella Notte" sequence? Or was it Bill Hamlin and Oliver Wallace doing the singing? (Hamlin and Wallace are credited as performing the song on the "Disney: A Legacy in Song" CD...)
Some help on this would be appreciated...