Question: In the summer of 1972, "Metal Guru" was the last UK number one for T. Rex and its lead singer. What was his name?

Passages:
The Big O is the fifteenth music album recorded by Roy Orbison, his first for London Records in the United Kingdom, with the music and backing vocals provided by English group, the Art Movement on all tracks except for "Penny Arcade", which was a studio recording and released as a single in the UK in 1969, where it peaked at #27 and would be Orbison's last UK chart success during his lifetime.  "Penny Arcade" was also his biggest hit in Australia, spending four weeks at Number One around Christmas, 1969.  The second single, "Break My Mind", was Orbison's last Australian chart success during his lifetime, reaching #24 in March 1970.  The album was released in Europe in early 1970. Marc Bolan ( ; born Mark Feld; 30 September 1947 – 16 September 1977) was an English singer-songwriter, musician, guitarist, and poet.  He was best known as the lead singer of the glam rock band T. Rex.  Bolan was one of the pioneers of the glam rock movement of the 1970s.  He died at age 29 in a car accident a fortnight before his 30th birthday. The Slider is the seventh studio album by English glam rock act T. Rex, released on 21 July 1972 by record labels EMI and Reprise.  Two singles, "Telegram Sam" and "Metal Guru", were released to promote the album. English electronic music group Clean Bandit have released one studio album, three extended plays, seven singles (including one as a featured artist) and eleven music videos.  In December 2012, the group released their debut single "A+E", which peaked at number 100 on the UK Singles Chart.  The song is the lead single from their debut album, "New Eyes", which was released in May 2014.  The album's second single, "Mozart's House", charted at number seventeen on the UK Singles Chart, becoming Clean Bandit's first top twenty single on the chart. " Dust Clears" was released as the third single from the album, reaching number forty-three on the UK chart.  The album's fourth single, "Rather Be", features Jess Glynne and topped the UK Singles Chart, the group's first number one on the chart.  Their 2016 single "Rockabye", which features rapper Sean Paul and singer Anne-Marie, became their second number-one hit in the UK, becoming the Christmas number one single for 2016 in its seventh consecutive week at number-one.  The follow-up to "Rockabye", "Symphony", featured Zara Larsson and became their third UK number one single. "Respectable" is a Mel and Kim song written and produced by Stock/Aitken/Waterman that became a UK number one single for one week in March 1987.  It was the second UK number one single produced by Stock/Aitken/Waterman, following Dead or Alive's "You Spin Me Round (Like a Record)" in 1985, and the first UK number one single that Stock/Aitken/Waterman had written themselves.  The single also topped the charts in Germany, Switzerland, the Netherlands, Belgium, Finland, Australia and New Zealand in 1987. The discography of the Pet Shop Boys, an English electronic/pop music duo, comprises 13 studio albums, four compilation albums, two live albums, four remix albums, one extended play and 55 singles.  The duo's debut single, "West End Girls", was first released in 1984 but failed to chart in most regions.  However, the song was entirely re-recorded in late 1985, and this newly recorded version became their first number-one single, topping the UK Singles Chart, "Billboard" Hot 100 and Canadian Singles Chart.  Parlophone Records released the duo's debut album, "Please", in the United Kingdom in March 1986.  The album peaked at number three on the UK Albums Chart and was certified Platinum by the British Phonographic Industry (BPI).  It also peaked at number seven on the "Billboard" 200 in the United States and was certified Platinum by the Recording Industry Association of America (RIAA).  The following summer they released "It's a Sin", the lead single from their second album, "Actually".  The single became another UK number one and also reached number nine in the US.  This was followed by "What Have I Done to Deserve This? ", with Dusty Springfield, which peaked at number two in both the UK and US.  In the summer of 1987 the Pet Shop Boys recorded "Always on My Mind", a cover of the Brenda Lee track, and it became their third UK number-one single over Christmas 1987.  This was followed by another UK number one, "Heart" in spring 1988.  The album "Actually" was released in September 1987, peaked at number two in the UK and was certified three-times Platinum by the BPI. James Aaron Diamond (28 September 1951 – 8 October 2015) was a Scottish singer-songwriter, best known for his three Top 5 hits.  The first was "I Won't Let You Down" (1982), as the lead singer in the trio PhD, with Tony Hymas and Simon Phillips.  His solo performance, "I Should Have Known Better", was a United Kingdom No.1 in 1984.  The third track was the theme song from "Boon", "Hi Ho Silver" which reached No.5 in the UK Singles Chart in 1986.  He has also featured as a vocalist on the charity No.1s "You'll Never Walk Alone" with The Crowd and "Let It Be" with Ferry Aid.  His last UK chart success was with "Young Love (Carry Me Away)" in 1986. "Gamblin' Man" was a 1957 hit single for skiffle artist Lonnie Donegan.  It was recorded live at the London Palladium and released as a double A side along with "Puttin' On the Style".  It reached No. 1 in the UK Singles Chart in June and July 1957, where it spent two weeks in this position.  This was the last UK number 1 to be released on 78 rpm format only, as 7' vinyl had become the norm by this time.  The original Pye Nixa does not exist on 7" format. "Children of the Revolution" is a song by T. Rex, written by Marc Bolan.  It was a No. 2 hit single in September 1972.  The song broke their sequence of four official single releases all reaching No. 1 on the UK Singles Chart ("Hot Love", "Get It On", "Telegram Sam", "Metal Guru").  It did not receive a regular album release. "Metal Guru" is a song by the British rock band T. Rex, written by Marc Bolan.  It was the band's fourth (and final) number one on the UK Singles Chart when it topped the chart for four weeks from May–June 1972.  It was also included on the album "The Slider" in 1972.

Supporting sentences:
 It was the band's fourth (and final) number one on the UK Singles Chart when it topped the chart for four weeks from May–June 1972.  He was best known as the lead singer of the glam rock band T. Rex.