Grimes' breakthrough album, Visons, was a left-field pop masterpiece founded on introverted soundscapes and subtle melodies. While it wasn't explicitly a pop record, the Canadian singer has never shied away from her admiration for the genre. In her Top 10 LP's of 2012 she listed Taylor Swift and Justin Bieber with no shame. Last night on Radio 1 she debuted, 'Go', which was originally written for Rihanna. The news emerged a number of weeks ago after she performed it at the Governors Balls in NYC. We can now replace that fan recording with this polished, recorded version. What it tells us is that Rihanna made a terrible mistake. Go is a trap-inspired banger that is actually hard to hear anyone but Grimes on. She's done it with friend and often-producer, Blood Diamonds.