Emerson String Quartet at Mostly Mozart

Mostly Mozart Festival. The storied Emersonians make their only festival appearance with a program that includes Haydn's Quartet in G minor, Op. 20, plus two works from Mozart: the Quartet in E-flat major, K.428, and the Clarinet Quintet—which boasts Martin Fröst as a guest performer. (At 6:30pm, the quartet will also offer a preconcert recital of Haydn's G major Quartet, Op. 33, No. 5.)