The way to unify the UI across devices is to merge the Music and Videos apps on the iPod touch and iPad, not split the iPod app on the iPhone. Dumb move.
It should be optional, in my opinion. I personally prefer having the iPod icon, merely because I enjoy being able to go to one place for all of my media. I'll likely place the music icon where the iPod icon is on the iPhone.
The decision to do this just seems odd. They initially grouped it all together in with the iPod icon for the very reason of having a lot of things in one place, and now they're essentially reversing their decision.
Then why does the iPad still not have a clock app, stocks, weather, etc?