The Suicide Squad‘s James Gunn has opened up about how he uses music in his films.The filmmaker, whose Marvel film Guardians Of The Galaxy featured a soundtrack of iconic 1970s hits, spoke to NME on the matter of music.“I write all of the songs into the screenplay, and then those songs we play on set as we do the scenes,” the filmmaker revealed.“So when you see them walk through the rain to Pixies‘ ‘Hey’, we have Pixies’ ‘Hey’ blasting on set.”He continued: “Not only do I have the songs that I