Watch Robin Thicke perform "Blurred Lines" with Jimmy Fallon and The Roots

Robin Thicke’s “Blurred Lines” has been a number one hit for most of the summer, and its ubiquity has been solidified by Jimmy Fallon. Thicke joined Late Night's Fallon and The Roots for a backstage performance with classroom-style instruments last night. Fallon did the same with Carly Rae Jepsen's “Call Me Maybe” last summer, and Mariah Carey also joined Fallon last Christmas for a rendition of “All I Want For Christmas Is You.”