Though it received much attention for an inspired touch suggested by a worker in the duo's then-management office -- namely, to get blue-eyed soul legend Dusty Springfield on the performance to make it a duet -- "What Have I Done to Deserve This" would have been a winner on its own. One of the duo's instantly catchiest melodies, purely pop without losing the sense of dancefloor punch that has always driven the Pet Shop Boys, "What Have I Done to Deserve This" springs to life with a seemingly off-kilter drum break, then slides right into a smart, deceptively simple, and full-bodied combination of big drums and sparkling keyboards. Chris Lowe pulls back the arrangements at points just enough to make the keyboard's re-entrances all the more subtly dramatic. Neil Tennant's detailing of a relationship -- in his usual fashion, the back story is hidden (he claimed the man in the couple was "a pathetic feeble wreck" and the woman "a major capitalist") -- allows him to come up with some wryly killer lines. Credit to the song's co-writer Allee Willis, though, who came up with the "since you went away" part that Springfield went to town on, showing that she hadn't lost any of the beautiful power that had made her a legend. It's a contrast in vocal styles that theoretically shouldn't work, but which connects just right.