Forward-thinking traditional groups Carolina Chocolate Drops and Punch Brothers also joined the label, as well as iconoclastic folk interpreter Sam Amidon. The Chocolate Drops, a group exploring the African-American roots of old-time music, won a Grammy Award for Best Traditional Folk Album for its Nonesuch debut, "Genuine Negro Jig". Mandolinist and composer Chris Thile of Punch Brothers was named a 2012 MacArthur Fellow, receiving one of 23 “genius” grant awards to extraordinary practitioners in a variety of creative fields. As a solo artist, he has also joined the classical ranks of the label, releasing the first of three discs of Bach's Sonatas and Partitas, written for the violin but transposed by Thile for mandolin.