Armen, you're right about him not using a capo. He DOES know his closed positions, but you'll find most of his songs are in the "straight" keys. The bit he added to "Jimmy Brown" (G//Em//C//G//) was to make the song a bit more like "sixties folk". Bobby Bare was also doin' some of that. It worked. The song AND the riff became popular in a cross-over way.

Rick