The early 80's session that produced the Queen-David Bowie collaboration on Under Pressure included the recording of other songs with both Bowie and Freddie Mercury, according to Brian May. The Queen guitarist recently revealed that additional tracks were laid down that haven't 'come to light yet'. "Yet" implies that they certainly could. May says there was a competitive tension between Bowie and Mercury that manifest itself in things like neither of them wanting to be the first to arrive at the studio. He added that the pair 'locked horns' at times while working out and recording Under Pressure but pointed out that, '...those are the things that happen in a studio, that's when the sparks fly and that's why it turned out so great.'