Bach's C major prelude from Book 1 of the Well Tempered Clavier from the arrangement for guitar in "The Baroque Gig Book for Guitar" available from guitarandlute.com
I wanted this to sound like it was written; the original transposes itself down an octave.
Discussion here:
http://12stringmusings.blogspot.com/2010/05/bach-prelude-1-in-c-major-bwv-846.html
