"Black Heart" is a song by British girl group Stooshe, taken from their debut album London with the Lights On (2013). 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. "Black Heart" is a ballad with a "Motown-esque" feel about it. Group member Courtney Rumbold revealed the song showcases Stooshe's different range, tones and styles. The lyrics to "Black Heart" talk of the issues of being in a relationship with a cheating lover. The cover art for "Black Heart" was released on 17 May. It depicts the girls in illustrated outfits and Jenny Mensah of 4Music called it "loud, bright and colourful".

Critical reception of the song has been generally positive. Rhik Samadder from The Guardian called "Black Heart" an "homage to 60s girl group melodrama", while 4Music's Nicolle Weeks branded it "a classic tune to swoon to". The accompanying music video was directed by Matt Stawski and released on 29 April. 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. The video depicts Stooshe as a girl group from the Sixties on the set of a television show. It shows band member Alexandra Buggs in a relationship with the host of the television show and him cheating on her with an assistant.

In April 2012, it was announced "Black Heart" would serve as the second official single from Stooshe's debut album. 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. Group member Karis Anderson commented that working with Lewis on the song was "amazing" as she is from a successful girl group (All Saints) herself. Anderson revealed "Black Heart" is a ballad and the opposite of what the band had released so far. She explained "I think we made our mind up that with every single we're gonna reinvent ourselves. This one is a bit Motown-esque." 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. 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.

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