Taking cues from Major Lazer and all those other artists who are rethinking what it means to be in the trap, "Go" is a departure from Grimes' usually cerebral witch-house pop. It's a wonder why Rihanna turned down the track, since the live version (the only one fans have heard so far) feels like it could fit on an Unapologetic B-side. Perhaps it's too trap-heavy? Who knows why Rihanna does what Rihanna does. Grimes should (and hopefully will) make the track her own, put it on her album, and call it a successful experiment. Or, she can try and pawn it off to a fellow Roc Nation peer. Either way, now that the live recording's been released into the ether, the pressure to release a high-quality studio version is stronger than ever.