Question: Carry On is a 4-CD career retrospective box set by Stephen Stills, including tracks with the vocal folk rock supergroup named what?
Sentence (from "Crosby, Stills, Nash &amp; Young"): Crosby, Stills & Nash (CSN) was a vocal folk rock supergroup made up of American singer-songwriters David Crosby and Stephen Stills and English singer-songwriter Graham Nash.
Relevant evidence: Yes