why no more ipod music games

Why no more iPod music games?

I was thinking about Phase, the iPod game, and wondering why there

aren't more music related games for the iPod platform? The interface

is simple and easy and there are lots of possibilities. Why not a kind

of electroplankton for the iPod where you can adapt to interact with

the music on your iPod using an interface like that of

electroplankton?

Or for that matter something like Jam Sessions? Play along to your fav

tracks?

Perhaps we'll see more thing like this once the iPhone /iPod Touch SDK