Question: In what year was the English rock band formed by the singer-songwriter to whom the posthumous album "You Scare Me to Death" is credited formed?

Context paragraphs:
T. Rex (band): T. Rex were an English rock band, formed in 1967 by singer-songwriter and guitarist Marc Bolan.  The band was initially called Tyrannosaurus Rex, and released four psychedelic folk albums under this name.  In 1969, Bolan began to shift from the band's early acoustic sound to an electric one.  The following year, he shortened their name to T. Rex.  The 1970 release of the single "Ride a White Swan" marked the culmination of this development, and the group soon became a commercial success as part of the emerging glam rock scene.

Billy Super Duper: Billy Super Duper is an album by English glam rock act T. Rex.  Released in 1982 by record label Marc on Wax, it was the first LP of entirely new and unheard material released after Marc Bolan's death in 1977 as the previous posthumous release, "You Scare Me to Death" consisted of demos first released in 1974.  Billy Super Duper consists of studio outtakes and home demos recorded by the band between 1972 and 1977, with arrangements produced by John and Shan Bramley (the heads of the Marc Bolan Fanclub at the time).  The album was intended to "complete" the demos and bring them up to date with contemporary music.

The Scare: The Scare is an Australian rock band formed in 2004 by Kiss Reid, Ben Lewis, Samuel Pearton and Liam O'Brien in Brisbane, Queensland.  They released their debut EP, "Masochist Mimes", in November 2004.  Brock Alexander Fitzgerald joined in 2005 and the band released a second EP, "Vacuum Irony" in October.  Wade Keighran joined later in the year and in 2006 the band relocated to Birmingham.

Eye of the Soundscape: Eye of the Soundscape is the seventh album by Polish progressive rock band Riverside.  The album is a collection of older experimental instrumental pieces in addition to four new tracks ("Where the River Flows", "Shine", "Sleepwalkers" and "Eye of the Soundscape").  It was released on 21 October 2016 through InsideOut Music.  It is the first, and only, posthumous album to feature guitarist Piotr Grudziński after his death on 21 February 2016.

The Shizit: The Shizit was a digital hardcore act from Seattle, Washington, USA, initially formed by J.P. Anderson and Brian Shrader in 1999.  The music was an intense mix of gabber, breakbeat, drum and bass, hardcore techno, hardcore and heavy metal guitars, amped up with aggressive political lyrics.  The band released two CDs on mp3.com, and as it was spread quickly among underground sources, the band steadily built up their following.  In 2001, they began work on their third album, ""Soundtrack for the Revolution""; The album was finally released at E115 Records, a Canadian indie label later that year, and tracks from it were released on Alec Empire's "Don't Fuck With US" compilation.  The band also joined Alec on his European tour, and the band added turntablist Jason Alberts.  In 2003, the band announced they were disbanding due to personal disputes between Anderson and Shrader.  A posthumous album was released on D-Trash Records, with artists remixing the "Soundtrack for the Revolution" album as "Remixed for the Revolution".

Como é Que Se Diz Eu te Amo: Como É que Se Diz Eu Te Amo ("How Can I Say I Love You") is the second live album by Brazilian rock band Legião Urbana, released in 2001.  It is the fourth posthumous album by the band after Renato Russo's death in 1996.

Distant (album): Distant is the final posthumous album by Champaign, Illinois indie rock band Sarge.  Released in 2000 on Mud Records, it features three demo versions of unreleased songs, six live songs, three cover songs, and two solo acoustic numbers by lead singer Elizabeth Elmore.

Deep Purple: Deep Purple are an English rock band formed in Hertford in 1968.  The band is considered to be among the pioneers of heavy metal and modern hard rock, although their musical approach changed over the years.  Originally formed as a progressive rock band, the band shifted to a heavier sound in 1970.  Deep Purple, together with Led Zeppelin and Black Sabbath, have been referred to as the "unholy trinity of British hard rock and heavy metal in the early to mid-seventies".  They were listed in the 1975 "Guinness Book of World Records" as "the globe's loudest band" for a 1972 concert at London's Rainbow Theatre, and have sold over 100 million albums worldwide.

You Scare Me to Death: You Scare Me to Death is a posthumous album credited to Marc Bolan of T. Rex.  Released in 1981 by record label Cherry Red, it is first LP of material released after his death in 1977.

As Quatro Estações ao Vivo: As Quatro Estações ao Vivo is the third live album by Brazilian rock band Legião Urbana, released in 2004.  It is the fifth and last posthumous album by the band following Renato Russo's death in 1996.

Supporting paragraphs: You Scare Me to Death T. Rex (band)
Answer: 1967