Ian Anderson's folkiness certainly comes out in Heavy Horses which could be considered a great folk rock album.
Equally Roland Kirk was considered by certain jazz critics to be just a vapid showman - a sort of Ian Anderson of jazz.
But those critics could come very badly unstuck. In his book Some Of My Best Friends Are Blues, Ronnie Scott recounts how the British musician and writer Steve Race was in Scott's club when Kirk was playing. He'd slagged Kirk off quite heavily so Kirk courteously invited him up on stage to play piano for him - then played his heart out and left Race for dead. As Scott says: "Kirk was a clown who could play Hamlet."