Question: Tons of Sobs is the debut album by which English rock band formed in London in 1968, best known for their 1970 signature song "All Right Now"?

Context paragraphs:
Free (band): Free were an English rock band formed in London in 1968, best known for their 1970 signature song "All Right Now".  They disbanded in 1973 and lead singer Paul Rodgers went on to become a frontman of the band Bad Company along with Simon Kirke on drums.  Lead guitarist Paul Kossoff formed Back Street Crawler in 1975, but died from a pulmonary embolism at the age of 25 in 1976.  Bassist Andy Fraser formed Sharks.

Live at Planet Rock Xmas Party: "Live at Planet Rock Xmas Party" is the first of a planned series of 'official bootlegs' by Northern Irish rock band The Answer.  It was recorded live at the Islington Academy in London on 11 December 2007 for the radio station Planet Rock.  During the concert Paul Rodgers joined the band on stage to sing two songs, "I'm a Mover" and "The Hunter", from his former band Free's debut album "Tons of Sobs" with the group.

Tons of Sobs: Tons of Sobs is the debut album by English blues rock band Free, released in the UK on 14 March 1969.  While the album failed to chart in the UK, it did reach #197 in the US.  Free are cited as one of the definitive bands of the British blues boom of the late 1960s even though this is the only album of their canon that can strictly be called blues rock.  The title of the album does not relate directly to the content of the album; it is possibly oblique reference to the darker, more sombre moments of the record.

Martha's Harbour: "Martha's Harbour" is a song by the English rock band All About Eve.  It became known as the group's signature song, reaching #10 in the UK Singles Chart and helping the group's self-titled debut album reach #7 in the UK albums chart.  The song was highly unusual for a 1980s pop hit, featuring only Julianne Regan's voice, acoustic guitars played by Tim Bricheno and background sound effects of the sea.

Led Zeppelin discography: The discography of the English rock band Led Zeppelin consists of nine studio albums, four live albums, nine compilation albums, 16 singles and eight music downloads. Formed in London in 1968, the group consisted of guitarist Jimmy Page, singer Robert Plant, bass player John Paul Jones, and drummer John Bonham.  The band pioneered the concept of album-oriented rock and often refused to release popular songs as singles.  Nevertheless, four of their ten songs that reached the Hot 100 had no mention of the title in the lyrics: "Immigrant Song", "Black Dog", "Over the Hills and Far Away", "D'yer Mak'er".  Their debut album, "Led Zeppelin" (1969), released by Atlantic Records, charted at number six on the UK Albums Chart and at number ten on the United States "Billboard" 200.  It received several sales certifications, including an 8 times multi-platinum from the Recording Industry Association of America (RIAA) and Diamond from the Music Canada.  Led Zeppelin's second studio album, "Led Zeppelin II", recorded when the band were on tour, was released a few months after the first.  It reached number one in several countries, including the UK and the US, where it was certified 12 times multi-platinum.  The album produced Led Zeppelin's most successful single, "Whole Lotta Love", which peaked at several music charts in the top 10. " Led Zeppelin III" (1970) was a softer, more folk-based effort compared to the hard rock of the band's previous releases.  It also peaked at number one in the UK and in the US.

Free discography: The discography of Free, an English blues rock band, consists of six studio albums, two live albums, 18 compilation albums, one extended play, 16 singles and two video albums. Formed in London in 1968 by vocalist Paul Rodgers, guitarist Paul Kossoff, bassist Andy Fraser and drummer Simon Kirke, the group signed with Island Records and released their debut album "Tons of Sobs" in 1969.  The album entered the US "Billboard" 200 chart at number 197.  Free's self-titled second album failed to chart, before the 1970 follow-up "Fire and Water" peaked at number 2 on the UK Albums Chart, supported by the popular single "All Right Now" which reached the same position on the UK Singles Chart.  The single also reached the top ten in a number of other regions, including the United States where it peaked at number 4 on the "Billboard" Hot 100.

List of signature songs: A signature song is the one song (or, in some cases, one of a few songs) that a popular and well-established recording artist or band is most closely identified with or best known for, even if they have had success with a variety of other songs.  There have also been instances where a film actor has acquired a signature song by giving a popular vocal performance in a feature.  Signature songs can be the result of spontaneous public identification, or a marketing tool developed by the music industry to promote artists, sell their recordings, and develop a fan base.

The Loved Ones: The Loved Ones were an Australian rock band formed in 1965 in Melbourne following the British Invasion.  The line-up of Gavin Anderson on drums, Ian Clyne on organ and piano, Gerry Humphrys on vocals and harmonica, Rob Lovett on guitar, and Kim Lynch on bass guitar recorded their early hits.  Their signature song, "The Loved One" reached number two on Australian singles charts, and was later covered by INXS.  In 2001 it was selected as number six on the APRA's list of Top 30 Australian songs of all time.  Their debut album, "The Loved Ones' Magic Box" was released late in 1967, which included other hit singles, "Ever Lovin' Man" and "Sad Dark Eyes".  They disbanded in October and, although the band's main career lasted only two years, they are regarded as one of the most significant Australian bands of the 1960s.  They reformed for a short tour in 1987 which provided the album, "Live on Blueberry Hill".  Humphrys lived in London from the mid-1970s until his death on 4 December 2005.  On 27 October 2010, The Loved Ones were inducted into the Australian Recording Industry Association (ARIA) Hall of Fame.

Free (Free album): Free is the second album by English rock group Free, recorded and released in 1969.  The band had spent time touring after their debut album "Tons of Sobs" the previous year, and there is a marked difference in the musicianship of the band as well as Paul Rodgers's voice.  Whereas "Tons of Sobs" had been produced by Guy Stevens, "Free" was produced by the head of Island Records, Chris Blackwell.

Taurus (instrumental): "Taurus" is a rock instrumental by American rock band Spirit, originally released on their self-titled debut album in 1968.  The track, composed by guitarist/singer Randy California, was recorded in November 1967.  It has been alleged that Jimmy Page borrowed the descending guitar figure from "Taurus" for Led Zeppelin's signature song "Stairway to Heaven".  Led Zeppelin opened for Spirit in an early American tour, providing the possibility that Led Zeppelin had heard the Spirit song before "Stairway to Heaven" was written.  In the liner notes to the 1996 reissue of Spirit's debut album, songwriter Randy California writes:

Supporting paragraphs: Tons of Sobs Free (band)
Answer: Free