Nicholas George Gravenites (/ɡrævɪˈnaɪtɪs/; born October 2, 1938) is an American blues, rock and folk singer, songwriter, and guitarist, best known for his work with Electric Flag as their lead singer, Janis Joplin, Mike Bloomfield and several influential bands and individuals of the generation springing from the 1960s and 1970s. He has sometimes performed under the stage names Nick "The Greek" Gravenites and Gravy.