Kronos Quartet is a string quartet founded by violinist David Harrington in 1973 in Seattle, Washington. Since 1978, the quartet has been based in San Francisco, California. The longest-running combination of performers (from 1978 to 1999) had Harrington and John Sherba on violin, Hank Dutt on viola, and Joan Jeanrenaud on cello. In 1999, Joan Jeanrenaud left Kronos because she was "eager for something new"; she was replaced by Jennifer Culp who, in turn, left in 2005 and was replaced by Jeffrey Zeigler. With almost forty studio albums to their credit and having performed worldwide, they were called "probably the most famous 'new music' group in the world" and were praised in philosophical studies of music for the inclusiveness of their repertoire.
[Taken from Wikipedia page]