http://www.rainymood.com/ <-- goes with anything
http://www.22tracks.com/ams/#radio538/3896
http://www.beatport.com/
http://www.goodmusicallday.com/
http://www.grooveshark.com/
http://simplynoise.com/
http://soundcloud.com/
http://stereomood.com/
http://www.whosampled.com/
http://www.youtube-mp3.org/