A string quartet that performs songs by Jimi Hendrix, Eric Clapton and Dizzy Gillespie? The members of the Turtle Island Quartet don't blink an eye at the prospect. Founded in 1985, the Grammy Award-winning foursome soars on an ability to merge classical aesthetics with contemporary musical styles. With this groundbreaking approach to chamber music comes a commitment to an ever-evolving sound and a vast repertoire. The artists the Oregonian calls "innovators to the core" head to Castleton State College where they pay tribute to Miles Davis and other jazz greats in "Birth of the Cool."