A while ago, ASIFA-Hollywood posted the bar sheets to the Merrie Melody Shuffle Off to Buffalo, directed by Rudy Ising. Hans Perk has now posted the complete bar sheets for the Mickey Mouse cartoon Thru the Mirror, directed by Dave Hand. In addition, he's posted a sheet with his annotations, explaining what the notations on the bar sheet mean. It's an excellent guide to figuring out how classic cartoons were timed to a musical score.
While you're at it, you can read Dave Hand's speech about directing made to the Disney staff, courtesy of Hans Perk. Here's part 1 and here's part 2.