Although it is usually left unstated, the 4th atom after melody, harmony and rhythm in constructing music is texture - the way the music sounds. Using trumpet synthesizers, Oud, voice, guitar synthesizers, Fender Rhodes, Fisarmonic and electric bass along with acoustic trumpet, piano and drums, Paolo Fresu creates a startling different sonority for the songs in the Gershwin-Dubose "Porgy and Bess " opera.