Graham Keith Gouldman (born 10 May 1946) is an English singer, musician and songwriter, best known as the co-lead singer and bassist of the art rock band 10cc. He has been the band's only constant member since its formation in 1972. Before 10cc, Gouldman worked as a freelance songwriter and penned many hits for major rock and pop groups, including the Yardbirds, the Hollies, Herman's Hermits and Ohio Express.

Source: Wikipedia (https://en.wikipedia.org/wiki/Graham_Gouldman)