Using a wide array of archive and some fairly honest and potent interviews, this documentary presents us with a short biopic of rather an enigmatic gent. Initially, his dulcet tones earned him a decent enough living doing lucrative commercials and providing backing vocals until a session with David Bowie started his career on a largely unhindered upwards trajectory. His associations with Aretha Franklin, Bette Midler and Roberta Flack, his total - almost perfectionist - commitment to his art and his cheeky sense of humour all contributed further to a success that transcended not just US…