This is an AUTHENTIC HAND SIGNED ORIGINAL 8"x 10" color photo of folk rock supergroup made up of American singer-songwriters. David Crosby, Stephen Stills,  Graham Nash, and Neil Young. Crosby, Stills & Nash (CSN) is a folk rock supergroup made up of American singer-songwriters David Crosby and Stephen Stills, and English singer-songwriter Graham Nash. When joined by Canadian singer-songwriter Neil Young as a fourth member, they are called Crosby, Stills, Nash & Young (CSNY). They are noted for their intricate vocal harmonies, often tumultuous interpersonal relationships, political activism, and lasting influence on American music and culture.

CSN formed in 1968 shortly after Crosby, Stills and Nash performed together informally in July of that year, discovering they harmonized well. Crosby had been asked to leave The Byrds in late 1967, and Stills' band Buffalo Springfield had broken up in early 1968; Nash left his band The Hollies in December, and by early 1969 the trio had signed a recording contract with Atlantic Records. Their first album, Crosby, Stills & Nash, was released in May 1969, from which came two Top 40 hits, "Suite: Judy Blue Eyes"  and "Marrakesh Express" . In order to tour the album, the trio hired drummer Dallas Taylor and session bassist Greg Reeves, though they still needed a keyboardist; Ahmet Ertegun suggested Neil Young, who had played with Stills in Buffalo Springfield, and after some initial reluctance, the trio agreed, signing him on as a full member. The band, now named Crosby, Stills, Nash & Young, started their tour, and played their second gig at Woodstock Festival in the early morning hours of August 18, 1969. The first album with Young, Déjà Vu, reached number one in several international charts in 1970, and remains their best selling album, going on to sell over 8 million copies with three hit singles.