The Lindbergh Schools String Orchestras welcomed five-time Grammy-nominated Quartet San Francisco to the Lindbergh Auditorium last week. Quartet San Francisco was joined April 20 by the East Watson String Quartet, an ensemble of Lindbergh High School students; the Concord String Quartet, which includes Sperreng Middle School eighth grade orchestra members; and the Sperreng Eighth Grade Orchestra, directed by L. Michelle Howard. Above, Jeremy Cohen of Quartet San Francisco performs. William Cooke photo