A long, long time ago, rockers who wanted to show their melodic, sensitive side put their axes down to get handsy with 88 keys. Even Lennon and McCartney rebounded from a tough breakup with beautiful piano ballads. Two masters of the form each get three songs here: Billy Joel, the bard of Long Island, from a period when he seemingly spoke in indelible hooks, and Elton John, the madman across the water, whose muscular, stadium-filling style could never be called 'tickling the ivories.'