Wolfgang Amadeus Mozart, played by Jefferson Public Radio's Geoffrey Riley, will host the Repertory Singers' annual Mozart Birthday Bash at 3 p.m. Sunday, Feb. 10, in the Music Recital Hall on the Southern Oregon University campus, 1250 Siskiyou Blvd. Directed by Paul French, the choir will add works by Franz Haydn to this year's concert. Riley will provide stage asides about the composers and their music. Sparkling wine and pastries will be available during intermission. Tickets cost $25, $5 for students and Oregon Trail Card holders, and are available at Paddington Station and Music Coop, www.repsingers.org or by calling 541-552-0900.