Bob Brookmeyer, Music for String Quartet and Orchestra (Challenge). Brookmeyer long since worked himself out of the compulsion to write edgy electronic music and acoustic music that sounds electronic. This gorgeous four-part work finds him in the tonal center of his composer’s art. He conducts the formidable Metropole Orchestra and the Gustav Klimt String Quartet in a suite that melds the rhythmic sensibility of Brookmeyer’s jazz mastery with his uncommon depth of orchestral understanding. Its range runs from gravity to pure fun. It is not jazz. It is not classical. It is Brookmeyer.