'Tutorial No.1: Lemon' begins with Rihanna shaving the head of dancer Mette Towley. After that, the video heralding the return of Pharrell Williams's band N.E.R.D. (with Ri-Ri) is all about Towley.

Todd Tourso and Scott Cudmore direct Towley's riveting performance, in contrasting sequences shot in LA and New York. And it's photographed by Malik Sayeed, and choreographed by JaQuel Knight, both veterans of Beyoncé's Formation video.