UPDATE: they just closed out the U's at around 5:30 with a double dose of "Use Me" (Bill Withers followed by, er, Hootie). Not many V's, I'm guessing, so the question is can they wrap this up before 10pm? W and Y are the big factor, since they'll get away with one each of X ("Xanadu"? "X Offender"?) and Z (the previously revealed "Zooropa").