The Turtle Island Quartet (known as the "Turtle Island String Quartet" before the 2007 release of A Love Supreme: The Legacy of John Coltrane) is a San Francisco Bay Area based jazz string quartet formed in 1985 and still actively touring worldwide and recording as of 2011. They take the classical string quartet experiments of Béla Bartók and rack them up a notch, while occasionally revealing their bluegrass swing roots. They were the first string quartet to achieve artistic and commercial success integrating jazz improvisation