Bob Zentz is an American musician and educator from Norfolk, Virginia who has been performing for more than thirty years. He is a guitarist and also plays the autoharp, lute, melodeon, mouth harp, banjo, concertina and mandolin. He specializes in historical and maritime music, and claims a repertoire of more than 2,000 songs.

https://en.wikipedia.org/wiki/Bob_Zentz
http://www.bobzentz.com/