Bach, P. D. Q. (1807 - 1742), Germany 
Biographical data, recommended CDs, books and sheet music, bibliography, and link to biographical essay from Dr. Estrella's Incredibly Abridged Dictionary of Composers.
http://stevenestrella.com/composers/composerfiles/bach1807.htmlP.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