Georg Solti hired cellist John Sharp in 1986, when Sharp was only 27, making him one of the youngest musicians ever appointed to a Chicago Symphony Orchestra principal chair. As a soloist with the orchestra he's performed Dvorak's Cello Concerto and Beethoven's Triple Concerto, with Itzhak Perlman and Daniel Barenboim. He consistently plays his section's solos with elegant phrasing and a gorgeous tone, and he has a remarkable ability to pick up a musical line from an unrelated instrument such as the clarinet and match its sound--all qualities essential to great chamber music making. For this program he'll be joined by violinist Ani Kavafian, local pianist Jorge Federico Osorio, violinist Desiree Ruhstrat, and violist Michael Strauss. They'll play Brahms's monumental, searingly passionate Piano Quintet in F Minor, op. 34, Mozart's Sonata for Violin and Piano in B-flat, K. 378, and Mozart's magnificent Piano Quartet no. 2 in E-flat, K. 493, one of the composer's finest chamber works to include the piano. a 7:30 PM, Pick-Staiger Concert Hall, Northwestern University, 50 Arts Circle Dr., Evanston, 847-467-4000, $25, $23 for seniors, $12 for students.