Sugar Blue

American blues singer and harmonica player, born December 16, 1949.
He first recorded in 1975 as a sideman on Blue Labor and Spivey, after which he relocated to France. He returned to the US in 1981.
Apparently found busking in the Paris Metro whilst the Rolling Stones were cutting "Some Girls" at the Pathe Marconi Studios, he was brought in to play on "Miss You".