No matter which way you look at it, Pop doesn't have the same shock of the new that Achtung Baby delivered on first listen. Less experimental and more song-oriented than Zooropa, Pop attempts to sell the glitzy rush of techno to an audience weaned on arena rock. And that audience includes U2 themselves. While they never sound like they don't believe in what they're doing, they still remove most of the radical elements of electronic dance, which is evident to anyone with just a passing knowledge of the Chemical Brothers and Underworld. To a new listener, Pop has flashes of surprise — particularly on the rampaging "Mofo" — but underneath the surface, U2 relies on anthemic rockers and ballads. "Discotheque" might be a little clumsy, but "Staring at the Sun" shimmers with synthesizers borrow...