Just for the record, Gould's not the only pianist to record the Well-tempered with humming. There's quite a bit of humming in Jano's Well-tempered! John WTC 1 part 2: http://stations.mp3s.com/stations/190/the_welltempered_clavier_bk_1_.html WTC 1 part 1: http://stations.mp3s.com/stations/244/bach_welltempered_clavier_bk_1.html