Pop, the hotly anticipated new album from either The Backstreet Boys or 'N Sync, hit record stores Tuesday. 'I'm pretty sure this is Backstreet Boys, because that's the band where The Tough One has the goatee and the beads in his hair but no blond streaks, right?' said David Blitz, manager of the Times Square Virgin Megastore where the band made a special in-store appearance Monday before thousands of screaming fans. 'Whichever band this is, though, they're definitely poised to take back their crown from the other band.' The new album is said to reflect either The Backstreet Boys or 'N Sync's maturing sound, with several darker tracks exploring the perils of fame. 