Few female singers matched the hard-swinging and equally hard-living Anita O'Day for sheer exuberance and talent in all areas of jazz vocals. Though three or four outshone her in pure quality of voice, her splendid improvising, wide dynamic tone, and innate sense of rhythm made her the most enjoyable singer of the age. O'Day's first appearances in a big band shattered the traditional image of a demure female vocalist by swinging just as hard as the other musicians on the bandstand, best heard on her vocal trading with Roy Eldridge on the Gene Krupa recording "Let Me Off Uptown...