The grandest discovery and joy come from hearing concept albums, such as they were, torn apart and reassembled as a gathering of rootless singles; it's far better when "Mysterious Ways" gives way to "Beautiful Day" instead of Bono tryin' to throw his arms around the world and a blast when "Hold Me, Thrill Me" is followed out onto the dance floor by a new mix of "Discothèque," the greatest U2 single that wasn't. Odd that the band would include the William Orbit remix of "Electrical Storm," the new single, on the first disc; it fits better on the nonessential second, a compendium of redos intended for the clubs, most of which went out of business in 1998. Better to hear the Edge's edgy guitar -- strings like razors, played with bloodied fingers -- than imagine it, which is all the remixes can offer. Turns out it was precisely what the band couldn't leave behind.