Again, I'm not saying the music is *bad* by any means, just that I know Nintendo could do better. The Great Palace certainly could be done more justice than this, I feel. Of course, that's mainly an arrangement/instrumentation issue, but still, changing up the melody to go with the theme wouldn't have hurt. On the other hand, Meta Knight’s Revenge kicks ass, so it's not like its all bad ('ouch' about the tinny electric guitar, though).
Ah, and Nazatips did point out that you can choose your music for the stage, though, so at least you won't be stuck with any songs you don't like (if any).