I just noticed that an error crept into the final copy of last week's column, and I'm surprised there hasn't been a spate of irate letters about it. The Well-Tempered Clavier is not a set of "piano preludes and fugues." Bach was unacquainted with Signor Cristofori's pianoforte invention at the time he wrote Book I. Is this, Sir, what passes now for criticism in the once august pages of the New Yorker? Cancel my subscription forthwith and posthaste. (An editor writes: the word "piano" was meant to go in front of "reading," not "preludes and fugues.") The other mistake in the piece is that it did not mention Lorraine Hunt Lieberson's Handel disc, which I just bought at Virgin Megastore, of all places, and cannot stop listening to.