The main reason I like this cartoon so much is that this is one of the most unique Bugs Bunny cartoons I've seen in quite some time. It finally takes a step away from the classic "Bugs gets chased" or also popular "Bugs in Hollywood" frames for this new idea, in which Bugs conducts a symphony at the Hollywood Bowl. Bugs gives a hilarious performance in the first place (the cuffs falling off his jacket has got to be one of the funniest things I've ever seen), but add to it a fly that keeps bugging him, and you get comedy in its finest.
Also, and this may not make much sense, but one of my favorite parts is when we see Bugs conducting and his coat-tails and ears start doing the work for him. I don't know why, but I just love seeing his ears do that, it makes me smile and giggle all the time. The music is great, and the animation truly follows it, proving once again that a cartoon is only as good as the music that supports it.