Tranquility Base was started as a side project to enable Above & Beyond to release a remix which was rejected. They'd tried to make a certain record sound a little cooler than it did, and thought they'd succeeded. Unfortunately, the A&R man (who shall remain clueless) disagreed, describing their mix as 'not too bad'. Secretly they were delighted, as a rejected remix is a free track for them, so they changed the riff and put it out under a pseudonym.