My list of atheist songs/musicians:

Atheist Peace - by Bad Religion
No Escape from Heaven - Curve
The Hand of the Almighty - John R Butler
Christianity is Stupid - Negativland
Anything by Shelley Segal
Tim Minchin
Greydon Squared

https://www.youtube.com/playlist?list=PLsxOhszLWkHH80xAgpxk3amdVwKqfjGDl

There's more, but that's what comes to mind right now...