The Man That Got Away"Over the Rainbow," "Stormy Weather," and "One for My Baby" are just a few of Harold Arlen's well loved compositions. Yet his name is hardly known except to the musicians who venerate him. At a gathering of songwriters George Gershwin called him "the best of us." Irving Berlin agreed. Paul McCartney sent him a fan letter and became his publisher. Bob Dylan wrote of his fascination with Arlen's "bittersweet, lonely world." A cantor's son, Arlen