Thanks David and Gianugo for inspiring me to buy A State of Wonder, by Glenn Gould. It takes some time getting used to him singing along, but other than that it's a delightful intro into Bach for a newbie, and much more accessible classical music than your typical Arvo Pärt.
Heh. I picked up his Well-Tempered Clavier a while ago, and listening to it on the laptop, all I heard was piano. Plonked it into the player in the car, with the very large amp and very good speaks, and suddenly I hear him moaning along as he plays.
I think "singing" is being too generous, at least on this recording.
Hey, welcome to the classical world! Next step to finish your homework: tell us which (1955 or 1981) recording you like best, and possibly listen to some more "classical" Goldbergs (Murray Perahia maybe?) to see the difference...