We've seen a lot of Robert (Bob) Clampett in here lately (Time for Beany, Beany and Cecil, the story of Tweety Bird) and now we find him near the top of his game at Warner Brothers in 1943's A Corny Concerto.
A great way to introduce your kids to classical music, as this cartoon was intended as a parody of Disney's Fantasia and Silly Symphonies theatrical cartoons. The only Clampett Warner's cartoons that best this one are The Great Piggy Bank Robbery, and The Old Grey Hare, which are not available in their entirety on YouTube. More's the pity.