"Mars" (sometimes listed as "Main Theme") is a musical theme that was composed by Nick Ingman and Terry Devine-King. It is used in "For Love," Gamescom's 2009 trailer for Heavy Rain.
This theme does not appear on the Heavy Rain Original Soundtrack or the Official Soundtrack List. Some sources claim that Normand Corbeil composed "Mars," but this is false - he composed "Ethan Mars' Main Theme," with which this theme is occasionally confused.