More notable for their later achievements and peripheral connections to important industry figures than for their music, the Modern Folk Quartet made commercially minded folk in the early '60s with an emphasis on group harmonies. They were not far removed from the Kingston Trio in sound, though they were mildly hipper than the most mainstream outfits like Chad Mitchell. Each of the quartet would go on to make a significant mark in music or media that had little to do with the folk revival. Jerry Yester did some production for the Association and Tim Buckley, was briefly in the...