Question: American rock band, Buffalo Springfield, active from 1966 to 1968 released three albums, released what single written by Stephen Stills, that peaked at number seven on the Billboard Hot 100 chart?

Context paragraphs:
Buffalo Springfield (compilation album): Buffalo Springfield is a compilation album released on Atco Records in 1973.  It is the fifth album by rock band Buffalo Springfield, and their second compilation.  It was assembled by the label well after the band had broken up at a time when Crosby, Stills, Nash & Young were both quite popular and had not released any new material as a group for over two years, with their 1974 reunion tour eight months away.  It features a nine-minute extended version of the song "Bluebird" by Stephen Stills (consisting of a live jam appended to the studio version), only available elsewhere on the Warner Special Products LP compilation "Heavy Metal – 24 Electrifying Performances" (Volume 2 in the "Superstars of the 70's" series), released in 1974.  It has never been issued on compact disc in North America and is currently out of print.

For What It's Worth: "For What It's Worth (Stop, Hey What's That Sound)" (often referred to as simply "For What It's Worth") is a song written by Stephen Stills.  It was performed by Buffalo Springfield, recorded on December 5, 1966, and released as a single on Atco Records in January 1967.  The single peaked at number seven on the "Billboard" Hot 100 chart.  This song is currently ranked number 63 on "Rolling Stone"' s list of The 500 Greatest Songs of All Time as well as the eighth best song of 1967 by Acclaimed Music.

Long May You Run: Long May You Run is an album credited to the Stills-Young Band, a collaboration between Stephen Stills and Neil Young, released in 1976 on Reprise Records, catalogue MS 2253.  It peaked at #26 on the "Billboard" 200 and certified gold in the U.S. by the RIAA.  The album is the sole studio release by Stills and Young in tandem.  Musically, it follows mostly in a similar vein to the duo's other joint work with Buffalo Springfield and Crosby, Stills, Nash & Young, traversing various facets of Americana and folk music, while songs such as "Make Love To You" have something of a jazz feel, and the extensive use of synthesised strings on the second side give the songs an art rock sound.

Train discography: American pop rock band Train has released ten studio albums, two live albums, one video album, four extended plays, 30 singles, four promotional singles, and 26 music videos.  The band independently released their eponymous debut studio album in 1996, two years after their formation.  In February 1998, the band signed to Aware Records and Columbia Records and re-released the album under the two labels.  Three singles were released from "Train"; the album's second single, "Meet Virginia", peaked at number 20 on the US "Billboard" Hot 100.  The album peaked at number 76 on the US "Billboard" 200 and was certified platinum by the Recording Industry Association of America (RIAA).  In the period following the release of "Train", producer Brendan O'Brien started working with the band in a partnership that would last for three albums.  The band released their second studio album "Drops of Jupiter" in March 2001; it was preceded by the release of its lead single, "Drops of Jupiter (Tell Me)".  The single became a commercial success, peaking at number five on the US "Billboard" Hot 100 and also becoming a top ten hit in Australia, the Netherlands and the United Kingdom.  "Drops of Jupiter (Tell Me)" also won an award for Best Rock Song at the 44th Grammy Awards.  The album peaked at number six on the "Billboard" 200, earning a double platinum certification from the RIAA. " She's on Fire", the third single from "Drops of Jupiter", achieved moderate success in Australia and the UK.  Train's third studio album, "My Private Nation", was released in June 2003.  It peaked at number six on the "Billboard" 200 and was certified platinum by the RIAA.  The album's first two singles, "Calling All Angels" and "When I Look to the Sky", peaked at numbers 19 and 74 respectively on the "Billboard" Hot 100.  The band released their fourth studio album "For Me, It's You" in January 2006.  The album peaked at number 10 on the "Billboard" 200 and spawned three singles.

Buffalo Springfield (box set): 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.

Neil Young: Neil Percival Young, {'1': ", '2': ", '3': ", '4': "} (born November 12, 1945), is a Canadian singer-songwriter, musician, producer, director and screenwriter.  After embarking on a music career in the 1960s, he moved to Los Angeles, where he formed Buffalo Springfield with Stephen Stills, Richie Furay and others.  Young had released two solo albums by the time he joined Crosby, Stills & Nash in 1969, in addition to two as a member of Buffalo Springfield.  From his early solo albums and those with his backing band Crazy Horse, Young has recorded a steady stream of studio and live albums, sometimes warring with his recording company along the way.

Kristen Stills: Kristen Stills (née Hathaway; born 12 October 1966) is an executive producer and autism awareness activist.  She is wife of American musician and multi-instrumentalist Stephen Stills of Buffalo Springfield and Crosby, Stills, Nash & Young.  She starred with son Henry Stills in an independent documentary film directed by Tricia Regan titled "" which was released in April 2007.  She received an "Outstanding Nonfiction Special" Emmy Award for her role as Executive Producer on "".  Since 2012, Kristen and Stephen have hosted Light Up The Blues, an event that benefits autism science and advocacy organization Autism Speaks.  The annual event has included musical performances by Crosby, Stills & Nash, Neil Young, John Mayer, The White Buffalo, Brandi Carlile, Ryan Adams, Steve Earle, Rickie Lee Jones, Lucinda Williams, Don Felder, and Chris Stills who perform alongside Spectrum Artists such as Nick Guzman, Matt Savage, and Rio "Soulshocka" Wyles.  The scheduling coincides with Light It Up Blue, World Autism Awareness Day and Autism Awareness Month in April.  In 2013, Stills was executive producer for the concert film "Light Up The Blues" the goal of which was to raise awareness for the annual event.

Buffalo Springfield: Buffalo Springfield was an American rock band active from 1966 to 1968 containing Stephen Stills, Neil Young, and Richie Furay, which released three albums, and several singles including "For What It's Worth".  The band combined elements of folk and country music with British invasion and psychedelia influences, and, along with the Byrds, were part of the early development of the folk rock genre.

Buffalo Springfield (album): Buffalo Springfield is the eponymous debut album by the folk rock band Buffalo Springfield, released in December of 1966 on Atco Records.  It peaked at #80 on the Billboard Top Pop Albums chart.  It is the first album to feature the songwriting of future stars Stephen Stills and Neil Young.

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.  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.

Supporting paragraphs: Buffalo Springfield For What It's Worth
Answer: For What It's Worth