When playing imported songs I have more difficulty playing expert mode on the keyboard than the guitar, due to the fast notes & chords being structured for a guitar

You'll find that the disc only has 63 songs with keys out of the 83, and at least 6 of those 63 tracks aren't really worth playing, unless you enjoy hitting 5 notes and then playing nothing for half the song

I believe (not certain)they only make you play the right hand notes, but you can use both hands anyway, I do

On the game the notes on pro are fairly clear to read, the track is lit by the colors according to where you should be playing

I should mention that the Rockband 3 songs let you play the keyboard in either "normal mode" (five colours) or "pro keys mode" (proper keyboard notes, with black and white keys) mode