What happen when you take a bluegrass great and a jazz virtuoso and hand each of them a 1939 Martin guitar? Pure magic. Chris Eldridge is best known for his bluegrass work with the Punch Brothers but he's also enhanced the music of artists as varied as Paul Simon, Renée Fleming, and Elvis Costello. Julian Lage was touring with Gary Burton when he was 15 and has since played with David Grisman and Nnenna Freelon. Take my word, at Abilene, they will play (and Eldridge will sing) with the simpatico of a duo that's been together for decades.