I always think that design goes hand-in-hand with design (and art). I tend to work better when I'm listening to some good music, discussion or play.
What prompted this post was a story on the BBC about Delia Derbyshire, the woman who composed the original Doctor Who theme music in 1963. Apparently, they have found another 267 tapes of hers, including an electronic dance track which was years ahead of its time. She has been cited as an influence by the Chemical Brothers, Sonic Boom and Orbital.
Delia died in July 2001. To learn more about Delia and her music at www.delia-derbyshire.org. There are a lot of music clips including one of John Peel from 1969.
A good post here as well.