The top guy is a post-apocalyptic minstrel. On his journey through the wasteland, he markets himself as entertainer, or offers his drumming services to any local cult. (These P.A. cults are into either drums, chants, or both.) All of this is a guise however, he's really a spy, sent out by a warlord to gauge the defenses of rival tribes. He's no stranger to combat either, and conceals weapons in his elaborate disguise. Incidentally, the drum on the left doesn't sound as hollow as the others.