The Cat Concerto is a 1947 animated short which is the 29th of Tom and Jerry shorts. It is a very good entry that is probably the most famous one in the series.
Tom is playing a piano in a concert, but awakes Jerry who is sleeping in it and the mouse tries to ruin his play. This is the cartoon that is the most well regarded of all Tom and Jerry shorts and is regularly cited as one of the best animated short films ever made. And while I do not agree with it and I even find it slightly overrated, it is definitely very good and it features a change in pace for the series with superb music that is the highlight here as it is so well incorporated into the action.
Yes, the action here is inventive and memorable and the two have many great moments. The ending is well realized and the film is funny, but it isn’t as funny as some other previous entries and the pacing is too slow at first which are the two reasons for why I do not find it is as amazing as others do. But it is still entertaining and it executes its setting so well with fine gags to spare.