Question: Carry On is a 4-CD career retrospective box set by Stephen Stills, including tracks with the vocal folk rock supergroup named what?
Context: Carry On is the twelfth album by Crosby, Stills & Nash, issued on Atlantic Records in 1991, generally for the European and Australian markets (and not to be confused with the Stephen Stills box set released in 2013).  It is a two-disc sampler of their four-disc box set, "CSN", released two months previously in the United States and the United Kingdom.  It features material spanning 1968 through 1990 from their catalogue of recordings as a group in addition to selections from Crosby & Nash, Manassas, and their individual solo albums.  It was reissued on 30 June 1998 on the WEA International record label. Beckology by guitarist Jeff Beck was released in 1991 as a 3 CD career retrospective.  Beckology covers the work of a guitarist widely acknowledged as one of the most influential and gifted exponents of the electric guitar, from early days with The Tridents through to his "Guitar Shop" album in 1989. Carry On is a 4-CD career retrospective box set by Stephen Stills (not to be confused with the CSN compilation released in 1991).  It features highlights from his career as a solo artist and with groups including The Au Go Go Singers, Buffalo Springfield, Manassas, and various permutations of CSN&Y.  The tracks are arranged in general chronological order of release.  The album also includes previously unreleased material. Just Roll Tape: April 26, 1968 is a Stephen Stills demo album released in 2007.  In the sleeve notes to the CD, Stephen Stills recalls that he was present at a Judy Collins session in New York in 1968, and when she finished with studio time remaining, Stills paid the engineer privately to let him record song demos.  But Stills left the tapes in the studio and eventually considered them lost. 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.  They were known as Crosby, Stills, Nash & Young (CSNY) when joined by Canadian singer-songwriter Neil Young, who was an occasional fourth member.  They were noted for their intricate vocal harmonies, often tumultuous interpersonal relationships, political activism, and lasting influence on US music and culture.  Crosby, Stills & Nash were inducted into the Rock and Roll Hall of Fame and all three members were also inducted for their work in other groups (Crosby for the Byrds, Stills for Buffalo Springfield and Nash for the Hollies).  Neil Young has also been inducted as a solo artist and as a member of Buffalo Springfield. Boîte à Bonbons ("Box of Candies") is a 16-CD box set compilation of the recorded songs of Jacques Brel.  The limited edition box set was released to mark the 25th anniversary of Jacques Brel's death.  The box set includes 15 albums remastered from the original records.  CD digipacks are presented in their original sleeve with lyrics.  The box set also includes an illustrated booklet with various pictures, a biography, and Brel's citations and testimonies.  Also included are five never before released songs from the recording sessions of the album "Les Marquises".  Included with the booklet is a bonus CD containing 28 titles: 26 songs from Radio Hasselt recorded 14 and 21 August 1953, a recording from the Brel family's private collection, and a 1962 recording from the Dutch television show AVRO.  The box set is also available in an alternate velvet box format with CDs in crystal cases. Clouds In My Coffee is singer-songwriter Carly Simon's 21st album (and her first box set) released in 1995.  It is a three-disc, 58 song career retrospective box set that spans Simon's career from 1965 to 1995.  Also included are nine previously unreleased or hard-to-find songs.  The booklet includes numerous photographs and extensive liner notes by Simon. Trash Box is a 5-CD box set of mid-1960s garage rock and psychedelic rock recordings, primarily by American bands.  This box set is similar to the earlier "Pebbles Box" (a 5-LP box set) and includes almost all of the same recordings in that box set (and in the same order), along with numerous bonus tracks at the end of each disc.  Supposedly, "the Trash Box" collects the first five volumes of the CDs in the Pebbles series (i.e., those released by AIP Records, not to be confused with the 4 earlier CDs that were issued by ESD Records).  However, as is generally true of the CD reissues of these five volumes (though not nearly to the same extent), the tracks differ significantly on all five discs as compared to both the original Pebbles LPs and the later Pebbles CDs in the corresponding volumes; and the surf rock rarities on "Pebbles, Volume 4" have been eschewed entirely.  Overall, there are 109 tracks in the box set (excluding the introduction and ending cuts) as compared to 101 songs on the individual CDs and 72 tracks in the "Pebbles Box".  Although most of the recordings on "the Trash Box" were released at some point on one of the individual Pebbles albums, several of the songs have not appeared elsewhere in the Pebbles series.  Inexplicably, one of these songs is the well-known hit "I Fought the Law (but the Law Won)" by the Bobby Fuller Four (on Disc Four) – which is also included in the "Pebbles Box" – in place of the much rarer "Wine Wine Wine" by Bobby Fuller that appears on "Pebbles, Volume 2". Buffalo Springfield is a career retrospective album by the 1960s folk rock band of the same name, released in 2001.  Band member Neil Young assembled the tracks in chronological order to show how the band evolved and disintegrated in the span of two years.  Of the four CDs, the first three represent the actual box set while the fourth CD contains the band's first two albums, all but two tracks of which had already appeared in identical versions elsewhere on the first three CDs.  It reached #194 on Billboard's Top 200 Album chart, and stayed on the chart for the single week.  The set omits the stereo version of the "Buffalo Springfield" album, the mono version of "Buffalo Springfield Again", the album versions of "On The Way Home", "Pretty Girl Why", and "Four Days Gone" from "Last Time Around", and the songs "Carefree Country Day" and "In The Hour Of Not Quite Rain" from "Last Time Around".  It also lacks the long version of "Bluebird", only ever issued on the band's self-titled 2-LP compilation, "Buffalo Springfield," released in 1973. Keep an Eye on the Sky is a 4-CD, 98-song career retrospective box set from American rock group Big Star, released in 2009.  It features 52 unreleased tracks: demos, alternate takes, and live performances.  As well as material from founder member Chris Bell's earlier bands Rock City and Icewater, it includes all titles (in many cases as alternate mixes or demos) from Big Star's first three studio albums, "#1 Record", "Radio City", and "Third/Sister Lovers", and a recording of a 1973 Big Star concert.  Staged in January at Lafayette's Music Room, the Memphis venue used again in May for the Rock Writers' Convention, the concert took place after Bell's departure and before the remainder of the group began work on "Radio City".  The box set's liner notes won a 2011 Grammy Award for author Robert Gordon.
Answer: Crosby, Stills, Nash & Young