The Calidore String Quartet confirms that the centuries-old formula – two violins, a viola and a cello – is still very much alive and evolving.

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Tiny Desk Concerts from NPR Music feature your favorite musicians performing at All Songs Considered host Bob Boilen's desk in the NPR office. Hear Wilco, Adele, Passion Pit, Tinariwen, Miguel, The xx and many more. This is the audio version of the podcast. A video version is also available.