Thirty years ago, violinist Daniel Hope was called on the carpet for a serious offense at his music school: unauthorized practicing of the Mendelssohn Violin Concerto. His teachers said he wasn't ready. Hope says he just couldn't help himself. Those dazzling melodies and dizzying runs: who wouldn't ache to be able to play that? These days, Hope is authorized to play whatever he wants. He'll play his childhood dream piece, the Mendelssohn Violin Concerto, with the Los Angeles Chamber Orchestra.