The map above, called World Beat Music, is an amazing map of the world drawn out in musical notation. It's made by James Plakovic, who also made illustrations of musical luminaries like Bach, Mozart, Beethoven and Brahms in the same style.
Link - via Strange Maps (who has a larger pic)
See also: Crazy Sheet Music by Atushi Ojisama
Also - not map related but still similar - a program called MetaSynth allowed import of digital images and "mapping" onto frequencies, and true to his past (captivatingly disturbing) work, Aphex Twin incorporated an image of his face into a track on the Windowlicker EP. Google it, and be prepared to shiver :)
http://www.wired.com/news/images/full/fullface_hzmarks_f.jpg
Btw, I laugh so hard whenever I see a world map with the biggest continent cut in half...
Shameless cartography...