Three years ago a one-stringed guitarist, Robert “One String” Gibson, caused a small sensation at Jazz Fest and this year the Ocho Rios, Jamaican artist Brushy One Stringseemed likely to do the same. The stripped-down guitar is an obvious attention-getting device, Brushy uses the low E string to play walking basslines and the guitar’s lower body as a hand drum. His material alternated between patois-heavy dancehall reggae and old-school Rasta spirituality, all of it was strong and his voice stood up to the minimal accompaniment. It remains to be seen if Brushy will come up with a set’s worth of good material—His Destinyalbum has just seven songs and on Friday he did similar half-hour sets at the Blues Tent and the Jazz & Heritage stage—so Quint Davis’ intro of him as an “international phenomenon” may have been be a tad premature. Wait and see, but his US debut was promising.