From Wikipedia...
The Sparrow Quartet is an American acoustic music group that formed in 2005. Its members include Abigail Washburn (banjo and voice), Béla Fleck (banjo), Casey Driessen (violin), and Ben Sollee (cello). The group is known for its mixture of old-time music with Chinese lyrics and melodies, owing to Washburn's long-standing interest in Chinese culture. The band released their debut album, Abigail Washburn & The Sparrow Quartet, on May 20, 2008 on Nettwerk Records.

Read more about Abigail Washburn & The Sparrow Quartet on Last.fm.