James Blake revives his moniker Harmonimix for his first official single, due September 24 via R&S. The release will encompass two tracks, respectively titled “Confidence Boost” and “Saying,” both involving east London MC and former Roll Deep member, Trim. The cuts are over two years old, but will be pressed to vinyl for the very first time. You can now stream the A-Side tune “Confidence Boost” above. Blake is credited with writing and producing, while Trim wrote and performed the vocals.