Mentally divorce, for a moment, music from Richard Kelly’s Donnie Darko. You’re still left with a genre-defining film. A contemporary indie classic. A movie blurring the lines between horror, black comedy, teen drama and cult sci-fi mind-bender. Put it back – Michael Andrews’ motifs brimming with vintages Moogs and electric vibraphone, alongside era-defining jams from Tears For Fears, Oingo Boingo, Echo & The Bunnymen and more – and you have a near perfect big-screen encapsulation of a particular breed of ’80s suburban ennui.   Despite its lacklustre performance at the box office, Donnie Darko was, of course, a runaway critical…