Pianist and singer Billy Stewart was a distinctive and influential R&B vocalist whose stuttering delivery and word-repetition technique borrowed liberally from the jazz practice of scat singing. Born in Washington, D.C., in 1937, Stewart started singing publicly with his mother's group, the Stewart Gospel Singers, as a teenager. He moved into secular music by filling in occasionally for the Rainbows, a D.C.-area vocal group led by future soul star Don Covay; like fellow Rainbows substitute Marvin Gaye, Stewart never recorded with them. Despite winning a local talent contest wi...