Last night, the internet went bonkers when Grimes a.k.a. Claire Boucher announced that her brand new single would be released today at 7:30 UK time, and not just any single, but one produced by Blood Diamonds and originally written for Rihanna. Wow. True to her word, Zane Lowe has just premiered the song on his show for BBC Radio 1 (see single art above), which Grimes says is "our summer jam." It certainly is. "Go" is a balls-to-the-wall, go-berzerk orchestration, carrying hints of Boucher's classic trademarks, but also a bit more polished than anything from 2012's excellent Visions. Hear the summer jam below–download it here–and get pumped.