"....much of his work is as a parasite on musical structures created by others (this is not a criticism, just an observation)". Guess he's right in there with all those other parasites- you know, Woody Guthrie, Bill Monroe, Robert Johnson, Jimmie Rodgers, and a few thousand others. Nothing good ever came of their piggy-backing on musical structures created by others. Sheeeesh, what a bird-brained observation.