David Mackenzie’s Tonight You’re Mine offers an adequate travelogue depiction of Scotland’s T in the Park music festival, with a minuscule, tired story mixed in. Shot amid the real event, the movie’s best and most noteworthy moments are the montages, wide shots and other scenic depictions of the throngs cavorting around the various stages, tents and camping areas. The rest of it is flagrantly ridiculous junk, about feuding rockers Adam (Luke Treadaway) and Morello (Natalia Tena), who are handcuffed together by a black musician bent on teaching the white protagonists a lesson, fulfilling all the requirements of what Spike Lee calls the “magical Negro.”