Crosby, Stills, Nash & Young

Crosby, Stills & Nash (CSN) was a folk-rock supergroup made up of the American singer-songwriters David Crosby and Stephen Stills and the English singer-songwriter Graham Nash. When joined by the Canadian singer-songwriter Neil Young as a fourth member, they were called Crosby, Stills, Nash & Young (CSNY). They are noted for their intricate vocal harmonies and lasting influence on American music and culture, as well as their political activism and often tumultuous interpersonal relationships.