Back in a couple of September Friday Rush updates posts I reported some sightings of rapper Pharrell Williams wearing a Rush Test For Echo t-shirt. It was first spotted during a concert at the Stockholm Globe Arena as seen in this Guardian article, and then a fan posted this photo of himself with Williams backstage wear he was also wearing the t-shirt. Williams is one of the judges on NBC's The Voice and was wearing the t-shirt last night also as seen in this screenshot (thanks Facebook user Rick F). He must be a prog-rock fan since on the previous episode he was wearing a Yes t-shirt. Maybe he'll be wearing a Pink Floyd shirt next time? Thanks to Andrew G, Larry and Ty H for the heads up.