An astounding group of virtuoso musicians—Yo-Yo Ma on cello, Stuart Duncan on fiddle, Edgar Meyer on bass, and Chris Thile on mandolin—reunites for the first time in nearly a decade for a one-of-a-kind concert that combines blues and bluegrass with hints of Bach. Joined by vocalist Aoife O’Donovan, these exceptional artists create a singular sound that’s part composed, part improvised—music so unorthodox that the group likens it to a “goat rodeo,” an aviation term for an event that teeters on the edge of (yet successfully avoids) disaster.