The aforementioned One Direction hit, "Best Song Ever," made a splashy No. 2 debut thanks in part to its massive video play, but opening-week sales to rabid Directioners were also a major factor. AWOLNATION's "Sail," the exceptionally slow-moving Top 40 hit, has been helped by a number of video memes, many not by the band itself; but its recent break into the Top 20 has been fueled mostly by a gradual rise in airplay and sales. Norwegian comedy duo Ylvis debuted within the Top 30 a few weeks ago with their EDM parody "The Fox," an absurdist video that actually got them signed to a U.S. label — but the song is now also a Top 20 seller on iTunes. Even "Blurred Lines" — Robin Thicke's summer megasmash, which broke late last spring thanks to a video with even more unclad flesh and ultimately spent a dozen weeks at No. 1 — owes most of its success to record radio play and huge digital sales. People didn't just stream Thicke's panting video; nearly 6 million of them have purchased the song.