http://www.youtube.com/watch?v=6kasOZhZZmk
(first he sings in English before the more familiar version in French about halfway in)
The Four Insurgent Generals (Garcia Lorca)
http://www.youtube.com/watch?v=ZCa3Kslx-WI
The latter is from the album Songs of Free Men - a terrific album.
The House I Live in
http://www.youtube.com/watch?v=U3syulBjkng
The Peat Bog Soldiers (Moorsoldaten - Song from a German concentration camp)
http://www.youtube.com/watch?v=xAVIL7AoAt0
Oh How Proud Our Quiet Don
http://www.youtube.com/watch?v=GBMlhj7oWTo