I still think Wii Music seems a bit cheapish. I've looked at the songs, and there are many I don't know, and only a few I'm interested in. Far too few songs that seem interesting, and I cannot see why I should buy the game.
Also, how is the multiplayer? Can several people play at once?
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS