The piano had a huge influencee in American folk music, look at the host of well known(and totallty unknown) blues and boogie players. Also(at a lesser level of technique, but highly important) the piano accompaniment for dance music in Britain and Ireland was very common...seems to have lasted better in Scotland, but faded elsewhere. It doesnt seem to have translated well to the old Yamaha keyboards: a lot of people accompany ceilidh bands with them, or sing while playing them, but it doesnt do a lot for me, what I've heard.