"Four Walls / Paradise Circus" is a collaboration between Massive Attack and Burial, which was first released as a limited vinyl edition on 17 October 2011, with pre-orders from 10 October 2011. The single consists of Burial mixes of Massive Attack's previously unreleased track "Four Walls" and "Paradise Circus" featured in their 2010 album Heligoland. Both songs featured on the EP contain vocals, and lyrical contributions, by Hope Sandoval of Mazzy Star.
In late 2009, Daddy G appeared to suggest in an interview with Clash Music that there would be an equivalent remix album of Heligoland by Burial, yet various comments made afterwards cast major doubt on the prospect ever being more than an idle whim in reality. In May 2010, Robert Del Naja told Q magazine that, "It's happening, but we can't talk about it. (Burial)'s very private and paranoid about it."
The single release was limited to 1,000 copies worldwide, all of which were sold during the first day of pre-order. The single was pressed on heavyweight 180g 12” vinyl, housed in a hand numbered, gold glitter screen-printed sleeve designed by Massive Attack’s Robert Del Naja (3D). It was released on 17 October 2011.
^Kerr, Dave (2010-02-02). "Massive Attack: Two Man Army". The Skinny. Retrieved 2012-08-10. "I think I might have had too many drinks the night I made that statement. I started a fire, didn’t I? It was our total admiration for Burial, that’s what it was; it sort of spilled into enthusiasm about him doing something for us."