Well, this is the one where Tom is playing the 
Grand piano for a huge concert audience. The seat 
of the piano is one of the traditional kinds that 
opens up and you can store music inside (not to 
mention there are screws inside so you can adjust 
the height and such). Jerry is inside the seat 
(which you can see into a bit because Tom is 
short and so has the hieght adjusted up, if 
anyone can picture this ^_^).

I can't tell exactly where in the short this is 
from, but Jerry was doing a multitude of things 
under the seat, including rolling it all the way 
up and all the way down, swapping up Tom's music, 
rolling Tom's tail into the mechanism, etc. He 
would have been on separate layers since for most 
of the short this "butt shot" is all you see of 
Tom - and I'm sure they reused some of it instead 
of redrawing it.

And no, this is not how good my childhood 
memories are - I still rewatch the *old* Tom and 
Jerry shows when I can find a station that's 
gutsy enough to play them. ^_~  (The new ones are 
mostly worthless, in my always so humble 
opinion. . . ~_~)

Many Sharp Smiles,
--Drac