Nominated this year for the CMA's Musician of the Year award, Sam Bush represents the progressive side of bluegrass — an art form that was never as traditional as some folks might suppose. From Bowling Green, Ky., Bush doubled on fiddle as a teenager before taking up the mandolin full-time, and what Bush achieved in the ’70s amounted to an admission that bluegrass — much like jazz — had room to incorporate outside material and rhythmically savvy playing. Recorded with guitarist Wayne Stewart and banjo player Alan Munde, the album Poor Richard's Almanac sounds as fresh as it did upon its original 1969 release. Since then, Bush has proved himself an indispensable sideman with the likes of Emmylou Harris, as well as a substantial solo artist — his 2004 track "The Mahavishnu Mountain Boys" is downright amazing. He's a complete musician — a quester. That certainly would have made Bill Monroe proud.