I was looking at the EFF site about DRM in music and followed their link to Live gigs you can buy in DRM free downloads (Link to nugs.net presents LIVEDOWNLOADS | Catalog of MP3 FLAC Downloads). Although a lot of the artists of predominatly of the Alt and Indie seens that is a good representation with stuff from:

• Gomez
• Iron & Wine
• Barenaked Ladies
• The Editors

To name but a few.