For 50 years, San Francisco's Kronos Quartet - David Harrington (violin), John Sherba (violin), Hank Dutt (viola), and Paul Wiancko (cello) - has challenged and reimagined what a string quartet can be. Founded at a time when the form was largely centered on long-established, Western European traditions, Kronos has been at the forefront of revolutionizing the string quartet into a living art form that responds to the people and issues of our time....