Written by: Mutya Buena, Keisha Buchanan, Siobhán Donaghy and Dev Hynes
Produced by: Dev Hynes
UK release: September 2013
UK chart peak: 50
A lot was/is made of the fact that Flatline – the only single released by Mutya Keisha Siobhan under a name other than Sugababes – failed to set the charts on fire, but looking back on it now… in the same year as Icona Pop’s I Don’t Care and the big Miley Cyrus renaissance, it doesn’t sound like a Big Hit Song, does it? Which doesn’t make it any less of a masterpiece, it just makes it all the more shameful that they never got to put out anything else and we never heard what else they had in the tank.
Nobody does satisfying harmonies quite like these three, and the chorus of Flatline is magical in the way their voices blend together even better than they did way back when. Dev Hynes’ production accompanies them perfectly, and – though I will always be a Heidi and Amelle truther! – this song is every bit the cult classic all your gay friends say it is. The angst of a dying relationship never felt so dreamy.