O2Jam has been out A LOT longer then Audition, it's a GREAT game and it's free now http://www.o2jam.com.my/
And it has nothing to do with dancing :P
You play instruments with you keyboard, the character's doesn't dance at all, you just buy stuff for them and dress them up, level them up etc.
You get missions for some levels and stuff you have to complete to level up, it's a really great game, takes some practice to get the hang of it but once you're good at it, it's amazing. :]