Produced and written by Future Cut in collaboration with Jo Perry and Shaznay Lewis, it was released as the album's second official single by Warner Music UK from 15 June 2012.

Rhik Samadder from The Guardian called "Black Heart" an "homage to 60s girl group melodrama",[3] while 4Music's Nicolle Weeks branded it "a classic tune to swoon to".

It was shot in Los Angeles using vintage cameras and the setting uses a mixture of themes similar to those featured in the musicals Dreamgirls and Hairspray.

[5][6] Produced and written by Future Cut in collaboration with Jo Perry and Shaznay Lewis, "Black Heart" was released in the United Kingdom by Warner Music UK on 17 June 2012.

"[11] Alexandra Buggs stated that the track was her favourite from the album and that after being boxed into an "explicit upbeat category", the group decided to slow things down.

[10] Courtney Rumbold told Digital Spy's Robert Copsey and Jamie Wotton that all three members of Stooshe sing on the track and listeners would be able to hear their different ranges, tones and styles.

"[2] Rhik Samadder from The Guardian wrote that the song is an "open homage to 60s girl group melodrama"; which could possibly fit to the soundtrack of a Disney film about the serial killer Ted Bundy.

[3] Weeks branded the song a "stylised ballad" and "a classic tune to swoon to"; which also highlight's Stooshe's "stripped-down natural talent".

[4] Becca Longmire from Entertainmentwise.com commented that "Black Heart" will allow the group "to reinvent themselves, adding a little Motown with that signature Stooshe style.

[17] He had previously included it in the website's "10 tracks you need to hear" playlist and compared it to "The Promise", a song performed by Girls Aloud.

[21] A singles reviewer from the Huddersfield Daily Examiner wrote "Stripped right back to the bones with the Motown hallmark stamped all over it from the all-girl trio.

[30] "Black Heart" debuted at number four on the UK Singles Chart for the week ending 30 June 2012, after selling 53,065 copies.

"[11][42] Each day of filming was done in twenty-hour shifts and the group drank "energy shots" to help them focus, but Anderson told Copsey and Wotton from Digital Spy that she and the other band members "were all looking at each and cracking up" by the end of the shoot.

[11] The group told Ponciano Junior from MOBO that the video to "Black Heart" is "completely different" to the one accompanying their previous single "Love Me".

The music video ends with an outfit change, reminiscent of funeral clothes, alongside the now-painted black hearts, and Anderson and Rumbold consoling Buggs.

[43] The soLondon writer said the relationship story made "Black Heart" "not just another vacuous pop video, but something well-crafted and memorable, with great attention to detail.

She added that in the "Black Heart" video, "their usual tongue-in-cheek naughtiness takes a back seat to some impressive vocal abilities.