04/07/2013 12:19 BST | Updated 10/07/2013 10:39 BST

Old Sugababes Mutya Keisha Siobhan (MKS) Unveil New Song 'Flatline' (LISTEN)

Former Sugababes Siobhán Donaghy, Mutya Buena and Keisha Buchanan have unveiled their first single as a reformed group.

Their debut single under the name Mutya Keisha Siobhan (shortened to MKS) is the rather brilliant 'Flatline' produced by Dev Hynes – the man behind Solange's 'Losing You'.

Unveiling the track on Twitter, the group wrote:

It's the first new material by the original Sugababes in over 12 years and so far it seems to be going down a storm with critics.

Pitchfork wrote: "They sound melancholy but powerful, and entirely, boldly un-self-conscious of Dev Hynes' immaculate production."

And The Guardian said: "It's a song that doesn't immediately jump up and smack you about the face on first listen, but, much like this line-up's debut single as the Sugababes, Overload, there's something indescribably captivating about it all."

UPDATE: The trio will play their first headline gig at London’s Scala on Thursday, 1 August. Tickets go on sale Friday, 12 July at 9am.

LISTEN to 'Flatline' above and let us know what you think in the comments below...