Never call using GarageBand "creating real music" again.
I would love an option to write your own music in a game like Wii Music because that would make it substantially more creative, but as it is, it's pretty fun because there is no strict enforcement on how you can play the music. While you don't have direct control over the tones, you have total control over when you play and how many notes you play and with what instruments, letting you (and 3 other people) create unique "arrangements". This game is, of course, exactly the opposite of Guitar Hero. Also you can't knock a game that lets you scramble through the Mute City theme. Anyway, I got it as a gift, and I probably wouldn't have bought it on my own, but I'm glad I got it because it is fun, and another Wii game that I can play with my older brother and my mom and have fun.