John Maurice Hartman, 13 July 1923, Chicago, Illinois, USA, d. 15 September 1983, New York City, New York, USA. Having started to sing while still at school, Hartman went on to study at musical college. He became a professional following the end of the World War II and first attracted widespread attention singing with Earl Fatha Hines in 1947 and two years later with Erroll Garner. His rich, deep baritone lent itself to a range of material and he comfortably accommodated country music alongside popular songs of the day (which meant he was able to make the breakthrough into television), although his first and lasting preference was for jazz. Within a jazz context he inclined towards modernism, performing and recording with Dizzy Gillespie, John Coltrane, and Sir Roland Hanna. He was nominated for a Grammy in 1981 for his album Once In Every Life. Hartman veered from jazz to smooth easy listening and pop in his later years.
Source: The Encyclopedia of Popular Music by Colin Larkin. Licensed from Muze.