Question: What was the official single off of  Marina and the Diamonds' album which transitioned the band from new wave to electropop?

Context articles: Disconnect (song)
The Age of Plastic
Gone Too Far (Dragonette song)
Electra Heart
Visage discography
I'm a Ruin
Nouvelle Vague (band)
Power &amp; Control
Primadonna (Marina and the Diamonds song)
Happy (Marina and the Diamonds song)

"Disconnect" is a song by British electronic music group Clean Bandit and Welsh singer-songwriter Marina and the Diamonds.
 It was composed by Marina and the Diamonds and Jack Patterson, with the song's production handled by Luke Patterson, Jack Patterson and Mark Ralph.
 It was released to digital retailers on 23 June 2017, as the fourth single from the band's upcoming second studio album.
 The song is Marina and the Diamonds' first single since her 2015 album "Froot".
The Age of Plastic is the debut studio album by the British new wave duo The Buggles, composed of Trevor Horn and Geoff Downes.
 The name of the record was conceived from the group's intention of being a "plastic group".
 The album has lyrical themes of nostalgia and anxiety about the possible effects of modern technology.
 The titular song, "Living in the Plastic Age", views the experiences of watching media coverage of the Vietnam War, while "Kid Dynamo" follows a child overexposed to media and its resulting effects on him.
 Described by writers as the first technopop landmark, the record is an electropop new wave album that includes musical elements and influences of disco, punk, progressive rock and 1960s pop music.
 In a 1979 interview, Downes defined the album as "science fiction music.
 It's like modern psychedelic music.
 It's very futuristic."
"Gone Too Far" is an electropop/new wave song performed by Canadian band Dragonette.
 The song was written and produced by Dragonette for their second album "Fixin to Thrill" (2009).
 It serves as the album's second single, following the lead single, "Fixin' to Thrill".
 The song was released digitally in July 2009, and was later sent to radio airways in August 2009.
 "Gone Too Far" had its premiere when the band performed live at the Red Studios in New York, in October 2008.
 A music video for the song was made by friends of the band, and posted on the video hosting website YouTube.
 Music fans praised the cover art for the single, placing it among the most amazing cover art of all time.
Electra Heart is the second studio album by Welsh singer Marina Diamandis, professionally known as Marina and the Diamonds.
 It was released on 27 April 2012 by 679 Artists and Atlantic Records.
 Diamandis collaborated with producers including Liam Howe, Greg Kurstin, Dr. Luke, Diplo and StarGate during its recording, and subsequently transitioned from the new wave musical styles seen throughout her debut studio album, "The Family Jewels" (2010).
 Their efforts resulted in a concept album inspired by electropop music, a distinct departure from her earlier projects.
 Lyrically, the album discusses topics of love and identity.
 Diamandis created the title character "Electra Heart" to represent female archetypes in popular American culture (House Wife, Beauty Queen, Homewrecker and Idle Teen).
The discography of the British new wave band Visage consists of five studio albums, six compilation albums (including an E.P.) and numerous singles.
 Formed in 1978, the band released their first single "Tar" on the short-lived Radar Records label in 1979, before signing to Polydor Records in 1980.
 Their second single, "Fade To Grey", was released soon afterwards and became an international hit.
 After several personnel changes, the group disbanded in 1985, but a new line-up emerged in the 2000s, again led by vocalist Steve Strange.
 In 2013, the band released a new album, "Hearts and Knives", their first for 29 years.
 The following year, the band released "Orchestral", a live album featuring various classic Visage songs remade with a symphony orchestra.
 The band's final studio album, "Demons to Diamonds", was released in November 2015 (released posthumously following Strange's death in February that year).
"I’m a Ruin" is a song by Welsh singer-songwriter Marina Diamandis, professionally known as Marina and the Diamonds.
 It was released on 2 February 2015 as the third official single from her third studio album, "Froot", two months before the release of the album.
 A music video for the song was released the following day, and premiered on Noisey.
 During its initial premiere on BBC Radio 1 in the United Kingdom, host Huw Stephens announced that the song would be officially released as a single in the United Kingdom on 22 March 2015 .
 "I'm a Ruin" was praised by critics, who commended its production, lyrical content, and Diamandis' vocal delivery; it was further hailed as a highlight of "Froot".
Nouvelle Vague is a French band led by musicians Olivier Libaux and Marc Collin.
 Their name means "new wave" in French, and refers simultaneously to the French New Wave cinema movement of the 1960s, to the new wave music movement of the 1970s and 1980s, which provides many of the songs that the band cover, and to bossa nova (Portuguese for "new wave"), a musical style that the band frequently uses in its arrangements.
"Power & Control" is a song by Welsh singer Marina Diamandis, professionally known as Marina and the Diamonds, from her second studio album, "Electra Heart" (2012).
 It was released on 20 July 2012 by 679 Artists and Atlantic Records as the second single from the record.
 Diamandis collaborated with former Swedish House Mafia member Steve Angello while writing the track, and enlisted Greg Kurstin to oversee its production.
 An electropop and power pop track, "Power & Control" describes the struggle between romantic partners in achieving superiority in their relationship.
"Primadonna" is a song by Welsh singer-songwriter Marina and the Diamonds from her second studio album, "Electra Heart" (2012).
 It was released on 20 March 2012 as the album's official lead single.
 It was an international success, reaching the top five in Austria, Ireland and New Zealand.
"Happy" is a song by Welsh singer-songwriter Marina Diamandis, professionally known as Marina and the Diamonds.
 It is the opening track on her third album, "Froot", and was released on 12 December 2014 as the second song from her "Froot of the Month" campaign, which was the monthly release of a new song up until the album's release.
 An acoustic video for the song was released on 18 December 2014.
 The song also serves as the second official single from the album.