Violinist Natalie MacMaster and TED Musical Director Thomas Dolby play Dolby's original song "Blue Is a River" in this ethereal duet -- with a little dancing.

Natalie MacMaster and her musical partner Donnell Leahy play several tunes from the Cape Breton tradition -- a sprightly, soulful style of folk fiddling. It's an inspired collaboration that will have you clapping (and maybe dancing) along.