Catalyst String Quartet, Sphinx Foundation laureates, present a program of standard and contemporary chamber music, with works of George Walker, Haydn and Brahms and traditional Latin songs. The Sphinx Foundation was founded in 1997 to identify and develop African American and Latino classical musicians. This Sheldon Friends of Chamber Music concert will be Friday, April 11 at 8 pm at the Sheldon Museum of Art, 12th & R Sts, UNL. General admission $25, students $5. Pre-concert lecture on the musical program, 7:30 pm. Reception immediately following the concert.