The guitar hero, the tumultuous bard, the fierce philosopher, the young firebrand: Friends in the wilderness, who turned from comrades in arms in a bloody desert rebellion into dedicated artists, and finally into global messengers for the people of the Sahara. This is Tinariwen, the desert rebel rockers who transformed the hypnotic music of their homeland into a gritty new breed of electric blues and made die-hard fans of music heavies from Robert Plant to Bono.