Atheism music
Lists of atheist, skeptic and rationalist songs & musicians
Alabama Atheist's Music, a selection of songs about Atheism, agnosticism, religious doubt and ridicule
Atheist Playlist, compiled by Kids Without God
'Satan Is Real' Atheist Music Blog, a huge list of songs related to atheism, rationalism & science
Wikipedia's List of atheists in music
Party at God's A playlist of original music by Gom Jabbar on themes of atheism and humanism.
Musicians and groups who explicitly support atheism, skepticism and rationalism
Bad Religion, punk rocking since 30 years and counting
DJ Madson (Brian Flemming), The God Who Wasn't There's film & soundtrack
Drew Stedman on Facebook
Graydon Square
George Hrab
G.A. (Gifted Anomaly)
Irreverend James and the Critical Mass Choir, godless gospel
Parkway Drive, atheistic metal-core from down under
Shelley Segal on Souncloud
Stigmath on Soundcloud and facebook
Symphony of Science
Tombstone Da Deadman is a skeptical rapper on Youtube, Reverbnation & Facebook
Specific songs of note (Anthems)
Faithless, by Rush