The fusion of classical string quartet music with bluegrass sounds unlikely, but as young conservatory-trained musicians have entered the bluegrass field it is no longer such a long shot. In fact, both halves of the present collaboration between mandolinist and have progressive bluegrass credentials: first appeared with 's band in the 1970s and has a long record of inspiring a wide variety of collaborators, while was co-founded by the great pioneer of new acoustic music, violinist . is present here only in an arrangement of 's "Crossroads," which contains little that classical crossover quartets have not done before. 's erstwhile collaborator does better with a four-movement suite called "Interplay" that draws on Indian traditions and casts the mandolin in a variety of rhythmic roles, while writes several pieces featuring the mandolin as a more conventional lead. Probably the most intriguing works here are a group of Brazilian pieces in which and the quartet trade off functions. Fans of from the classical side and and especially the underrated on the bluegrass/new acoustic side will find much to enjoy here. ~ James Manheim