So the first track has got onto the in game store and it's Blue (Da Ba Dee) but there's a problem. Even though the track has charted keys and pro keys parts the store says there is no part.
On the dashboard version of the store the track appears and claims that it works in both RB2 and RB3.
The file also ends up with the other RB2 files on the hard drive.
Hope there aren't these troubles further down the line.
BTW the track is really fun to play in RB3.