Mountain dulcimers can play most any kind of music...check out Butch Ross, Stephen Seifert, Aaron O'Rourk, and Bing Futch among others (these just popped into my head--there's really a long list of mtn dulcimer players playing non-traditional dulcimer music or playing in non-traditional ways). My advice: play the music that's already in your heart or your head and see where it takes you!
Jan Potts, Lexington, KY
"Use what talents you possess; the woods would be very silent if no birds sang there except those that sang best." Henry Van Dyke