Fonzi Thornton has provided vocal accompaniment for which guitarist known for the song "Poetry Man"?
Fonzi Thornton:  His vocal credits can be found on the recordings of Aretha Franklin, Luther Vandross, Bryan Ferry, Roxy Music, CHIC, Diana Ross, Garth Brooks, Ray Charles, Mariah Carey, David Bowie, Robert Palmer, Patti Labelle, Al Jarreau, Celine Dion, Phoebe Snow and Bette Midler and many others. Phoebe Snow: Phoebe Snow (born Phoebe Ann Laub; July 17, 1950 – April 26, 2011) was an American singer, songwriter, and guitarist, best known for her 1975 song "Poetry Man".
Phoebe Snow