Crosby, Stills, Nash & Young formed out of the '60s groups the Byrds (David Crosby), Buffalo Springfield (Stephen Stills and Neil Young) and the Hollies (Graham Nash). They originally started in 1969 as a trio, adding Neil Young for their second album, 'Deja Vu,' in 1970. The group has gone through some tough times over the years, breaking up, reforming and splitting into other sections. The quartet has released only three albums since 1970; the trio has issued five. They've reunited sporadically over the years for concerts, with all of the members also putting out solo recordings at the same time.