Watch Grimes Perform a Song She Penned for Rihanna

At her Governors Ball set, Grimes delivered "Go," the song she wrote for Rihanna.

True to her word, Grimes aka Claire Boucher delivered three new songs at her Governors Ball set this weekend. As Boucher tweeted, one of the songs, "Go," she co-wrote with her Canadian cohort Blood Diamonds for Rihanna but it was ultimately rejected by Riri. Now video of the song has surfaced-- check it out below.

Watch Grimes Perform a Song She Penned for Rihanna