In Duke Ellington: A Listener???s Guide, Eddie Lambert says that ???long versions (of jazz compositions) featuring extended solos became popular as a result of the success of the tenor extravaganzas by such musicians as Illinois Jacquet and Flip Philips with Norman Granz???s Jazz at the Philharmonic.??? The Ellington band would play long versions of ???Things Ain???t What They Used to Be,??? often