Bear McCreary, the composer for Battlestar Galactica (as well as a number of other shows and movies), has a blog where he explains how he adapted Bob Dylan's "All Along the Watchtower" for the season three finale (when it goes into the archive, that entry will be located here). Putting the song into the show was a bizarre--but fascinating--step. Too bad we'll have to wait until January 2008 before we can find out what it means.
McCreary's blog actually features a few other interesting previous entries, especially the ones on the instrumentation he uses, and where he actually breaks apart the small musical themes that are used to score behind each character. Did you know? That irregular, single-note beat that opens the prologue to the show ("The cylons were created by man...") is actually in 9/8 time, and is played on the Javanese gamelan. Now you know.