Question: What type of band did a cover of a single that sold two million copies from 1969 to 1970?

Context articles: Ten Thousand Angels
Doctor and the Medics
Dummy (album)
Spirit in the Sky
Lutricia McNeal
Some Enchanted Evening (Blue Öyster Cult album)
Dinotopia
Sex and the Single Girl
They Only Come Out at Night
Hair of the Dog (album)

Ten Thousand Angels is the 1996 debut album of American country music singer Mindy McCready.
 It was released on BNA Records and sold two million copies being certified double platinum by the RIAA.
 The album peaked at #5 on the US country charts, and producing four chart singles on the country charts.
 The first single, which was the title track, reached #6, and was followed by her only #1 hit, "Guys Do It All the Time".
 Following this song was "Maybe He'll Notice Her Now", which featured backing vocals from Richie McDonald, the lead singer of the band Lonestar.
 This song peaked at #18.
 "A Girl's Gotta Do (What a Girl's Gotta Do)" was the final single, reaching #4 in 1997.
Doctor and the Medics are an English glam rock band formed in London in 1981.
 The group received their great success during the 1980s and are best known for their cover of Norman Greenbaum's "Spirit in the Sky", the group's hit single which reached No. 1 in the UK singles charts.
 The band currently performs, with a different line-up, as a tribute act to various artists.
 The group's musical style includes neo-psychedelia, glam rock, new wave and pop rock.
Dummy is the debut studio album by English electronic band Portishead.
 It was released on 22 August 1994, by Go!
 Beat Records.
 The album received critical acclaim, winning the 1995 Mercury Music Prize.
 It is often credited with popularising the trip hop genre, and is frequently cited in lists of the best albums of the 1990s.
 Although it achieved only modest chart success overseas, it peaked at number 2 on the UK Album Chart, and saw two of its three singles reach number 13.
 The album was certified gold in 1997 and has sold two million copies in Europe.
 The album was certified double platinum in the UK in 1996, for sales exceeding 600,000 copies.
 It had sold 825,000 copies in the United Kingdom as of September 2011.
"Spirit in the Sky" is a song written and originally recorded by Norman Greenbaum and released in late 1969.
 The single became a gold record, selling two million copies from 1969 to 1970 and reached number three on the US "Billboard" Hot 100 chart (April 18, 1970), where it lasted for 15 weeks in the Top 100.
 "Billboard" ranked the record the No. 22 song of 1970.
 It also climbed to number one on the UK, Australian and Canadian charts in 1970. "
Rolling Stone" ranked "Spirit in the Sky" No. 333 on its list of the 500 Greatest Songs of All Time.
 The song was featured on the 1969 album of the same name.
 Cover versions by Doctor and the Medics and Gareth Gates have also made the number 1 spot in the UK.
Lutricia McNeal (born November 27, 1973) is an American soul and pop singer.
 She achieved worldwide success with her cover version of "Ain't That Just the Way" which sold two million copies worldwide.
Some Enchanted Evening is the second live album by the American hard rock band Blue Öyster Cult, released in September 1978 (see 1978 in music).
 It is Blue Öyster Cult's best selling album, having sold two million copies, including over a million in the United States.
 The album's seven original tracks were recorded at various locations in the United States and England.
Dinotopia is a fictional utopia created by author and illustrator and Oracle Specialist James Gurney.
 It is the setting for the book series with which it shares its name.
 Dinotopia is an isolated island inhabited by shipwrecked humans and sentient dinosaurs who have learned to coexist peacefully as a single symbiotic society.
 The first book was published in 1992 and has "appeared in 18 languages in more than 30 countries and sold two million copies."
 "Dinotopia: A Land Apart from Time" and "Dinotopia: The World Beneath" both won Hugo awards for best original artwork.
Sex and the Single Girl is a 1962 non-fiction book by American writer Helen Gurley Brown, written as an advice book that encouraged women to become financially independent and experience sexual relationships before or without marriage.
 The book sold two million copies in three weeks, was sold in 35 countries and has made the "Los Angeles Times", "The New York Times" and "Time" bestseller lists.
They Only Come Out at Night is the third studio album by Edgar Winter and the first by the Edgar Winter Group.
 A commercial hit, the album reached the #3 slot on the "Billboard" 200 chart and also features two of the band's biggest songs: "Frankenstein" (#1 on the "Billboard" Hot 100) and "Free Ride" (#14 on that same chart).
 Musically, the album features a mixture of blues rock and pop rock influences in a generally carefree, upbeat sound.
 The album eventually sold two million copies.
Hair of the Dog is the sixth studio album by the Scottish hard rock band Nazareth, released in 1975.
 The album was recorded at Escape Studios, Kent, with additional recording and mixing at AIR Studios, London, and is the band's biggest selling album, having sold two million copies worldwide.