Wii music seems kind of interesting because you can do anything but it looks like it might be hard to control what notes you play. Otherwise it looks cool and you should probably get it.
Anyway, the new WiiSport Resort is going to be pretty fun... With the new WiiMotion plus and the new gmaes (Frisbee throwing, seedoo racing, and swordfighting) it'll make a great sequel to Wii Sports...