Elton John's new concert album "Live From the Rainbow Theatre With Ray Cooper" shines a spotlight on lesser-known tracks from his extensive catalog, recorded during a six-show residency in London in May 1977. The 13-song set features deep cuts like "Cage the Songbird," a tribute to Édith Piaf, and "Idol," a cabaret jazz ballad showcasing John's piano skills reminiscent of Liberace.