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The best workout songs and playlists for your running pace - jog.fm

Studies have shown that listening to music during exercise works wonders on the mind and body. http://jog.fm/
http://www.thepixelplant.net/dmf/dmf.html

Free online radio

Also if you want to see something really cool, check out RadioTuna : a search engine for free online radio we've been working on for the last year.