Billy Joel never was a classical pianist and it's not a fair comparison. In fact, the technical proficiency has been steadily increasing among classical musicians. Just compare the the way Liszt was played be the older generation like Horowitz to a more "modern" classical musician like Kissin. Then compare it to someone really recent like Valentina Lisitsa. Each generation added a whole new level of technical sophistication and level of detail, partly because the approaches to teaching/practice have been refined and partly because we have all sorts of nifty technology that helps with minor corrections/changes.If you play piano and hear Pachelbel's canon, Moonlight Sonata by Beethoven (noting that how he was near completely deaf when he composed it), pieces from Vivaldi, Chopin and compare it to Billy Joel's iconic piano man , there is no comparison in terms of skill level

