The sweet harmonies of Bobby Patterson and Willard Gayheart flow golden, like honey. The Galax native and the pencil artist from Hazard, Ky., have been playing music together for 40 years in various bands, but discovered a whole new depth of artistry through duet singing at the Blue Ridge Music Center. The friends and colleagues volunteered in 2007 to entertain visitors in the breezeway on Tuesdays during the season, and have ever since used their vast storehouse of song and story to add richness to the visitor’s experience. Patterson plays banjo and guitar, and sometimes mandolin. Gayheart specializes in guitar.