What: Sounds from the DIY music movement on http://www.last.fm/music/Crass

Why: Discover this punk music manifesto from the ‘70s, where bands launched a movement against all things capitalist —they made their own sound, recorded their own labels, and performed in basements. Check out Crass, the band that started it all, and for a new sound, visit myspace.com/axai.

When: You want your music from scratch.