It's hard to believe that the 80th birthday has come today for singer, songwriter and pop / rock icon and accomplished photographer Graham Nash. A founder of the British Invasion group The Hollies, Nash went on to form the first rock "supergroup" in 1969, Crosby, Stills and Nash (later adding Neil Young). Since 1978 a dual citizen of the U.S. and U.K, Nash is an outspoken progressive who has used his voice and talent to support environmental, anti-war and social justice causes over the years. Here are two of his signature songs with Nash singing lead vocals. Enjoy.