well first of all, there's practice practice practice. but you knew that. i would recommend sitting down with a song that has a decent beat and cool chords and just figuring out what the accomp is doing on the song and try to replicate it. nothing teaches like experience. get some midis off the net and turn off the accomp channels and try to play along. mess around, you'll pick it up. there are books, but i never found them too helpful. hope this helps! Zack