Lena Horne was a brilliant nightclub entertainer who also possessed a gift for musical theatre. Her performance on the calypso-flavoured “Pretty to Walk With”, from the 1957 production of Jamaica, is one of her most playful pieces, while “Watch What Happens”, a brassy number produced for her one-woman revue, is one of her most soulful. But she shines brightest on the bluesy, throaty “Singin' in the Rain”, the epitome of a showstopper.