New Gaga, Bieber tracks

YOUR MONDAY SONGS (TIPS ACCEPTED): The top two songs on the iTunes single chart are today's installments in one-song-a-week initiatives by major artists. Interscope's Lady Gaga told the world about "Do What U Want" featuring R. Kelly (from her forthcoming ARTPOP), landing at #1; Gaga has vowed to unleash a track every week until her 11/11 street date. Meanwhile, Def Jam/IDJ's Justin Bieber unveiled his latest Music Monday track, "Hold Tight" (now #2 and big in the U.K. as well, as the item below indicates) just after making headlines—and reportedly doling out the other kind of singles—at a Texas strip club. (10/21a)