Never heard of the Bellamy Brothers so I'd guess someone entirely different . . but you should be able to tell that from the links here.

Never could understand "folk-rockish" but I wouldn't have said it applied to Peter . .

On the other hand, heard some guy busking on Concertina in Cambridge (UK) city centre a year or so back, and his playing sounded REMARKABLY like Peter's (I'm sure I'd have been disillusioned had he started to sing . .)

G.