(Gary) Glitter was an album released in 1972 by British glam rock singer Gary Glitter, produced by Bell Records.
 Two tracks, "I Didn't Know I Loved You (Till I Saw You Rock and Roll)" and "Rock and Roll", the latter a song in two parts, achieved success as singles; each spent time amongst the top 40 singles in both the US and UK.
Leader II is a 1991 studio album by English musician Gary Glitter.
 It was his first album in seven years, 1984's "Boys Will Be Boys" being his previous album.
 The album includes the single "Ready to Rock".
Paul Francis Gadd (born 8 May 1944), known by the stage name Gary Glitter, is an English former glam rock singer, who achieved popular success in the 1970s and 80s.
 He was known for his extreme glam image of glitter suits, make-up and platform boots, and his energetic live performances.
 He sold over 20 million records, spent 168 weeks on the UK Singles Chart and had 21 hit singles placing him in the Top 100 UK most successful chart acts.
 From 1997, he returned to public notice for committing sex offences, being imprisoned for downloading child pornography in 1999, and child sexual abuse and attempted rape in 2006 and 2015.
G.G. (or "Gary Glitter") is the title of Gary Glitter's third studio album, which was released in 1975.
The Ultimate Gary Glitter – 25 Years of Hits is a greatest hits album by English glam rock singer Gary Glitter.
 It was originally released in the United Kingdom in 1997 on the label Snapper Music, days after his arrest for possession of child pornography.
"Another Rock and Roll Christmas" is a Christmas song by English glam rock singer Gary Glitter, written by Glitter with Mike Leander and Eddie (Edward John) Seago and produced by Mike Leander.
 It was one of the most played Christmas hits on UK radio from the mid-1980s to the mid-1990s, but is now rarely heard publicly following Glitter's convictions on child pornography and abuse charges.
 Initially released in 1984, the song was later included on Glitter's fifth studio album, "Boys Will Be Boys" (1984) and was reissued many times, both as a single (including a collectors picture disc) and on other albums.
The Execution of Gary Glitter is a ninety-minute mockumentary, produced by Juniper Communications Limited and broadcast on Channel 4 in the UK, which follows an imaginary trial and execution by hanging of former glam rock singer Gary Glitter, who has been convicted for possession of child pornography and sex with minors, for "offences against children".
 The programme was written, produced, and directed by Rob Coldstream, and was broadcast on 9 November 2009.
"Rock and Roll" (also known as "The Hey Song") is a song by English glam rock singer Gary Glitter that was released in 1972 as a single and on the album "Glitter".
 Co-written by Glitter and Mike Leander, the song is in two parts: Part 1 is a vocal track reflecting on the history of the genre, and Part 2 is a mostly instrumental piece.
 Both parts were popular in Britain, and the single went to No. 2 on the British charts.
 In concert, Glitter merged both into one performance.
The Glittermen were a glam rock band from England, who backed Gary Glitter, un-credited, on his first four hit singles, from June 1972 until the summer of 1973, when they then officially became known as The Glitter Band.
 Continuing to back Gary Glitter on some of his further hit singles, but now as 'The Glitter Band', they began releasing records of their own under their new name.
 As The Glitter Band, they had seven UK Top 20 hit singles between March 1974 through to April 1976, and three hit albums.
The Glitter Band are a glam rock band from England, who initially worked as Gary Glitter's backing band under that name from 1973, when they then began releasing records of their own.
 They were unofficially known as the Glittermen on the first four hit singles by Gary Glitter from 1972 to 1973.

Question: The Leader II album was produced by Gary Glitter who achieved popular success in what year?
Answer: 1970s