P.D.Q. Bach Bio
Official site of JSB's (possibly illegitimate or even counterfeit) twenty-first of his twenty children. Biography of one named "the most dangerous musician since Nero," purchase information (caveat emptor), concert and recording details, and links.
http://www.schickele.com/pdqbio.htm

P.D.Q. Bach
Biographical information on the twenty-first of J. S. Bach's twenty children with illustrations, works, recordings, books, audio books, video cassettes, and summaries of reviews at Presser.
http://www.presser.com/Composers/info.cfm?Name=PDQBACH

PDQ Bach Memorial Library at the University of Southern North Bondi in Sydney
References and resources dedicated to the fictitious composer and his flesh-and-blood alter ego Peter Schickele.
http://gabrielmccann.tripod.com/pdqbml.html

P. D. Q. Bach
Wikipedia article with summary, biography, musicography, works, and internal references to related topics.
http://en.wikipedia.org/wiki/P._D._Q._Bach

PDQ Bach Tidbits
Page designed for a middle school includes explanation of some of the humor and annotated links.
http://www.bandnotes.info/tidbits/tidbits-pdqbach.htm