Includes index.

One night in the early 1990s, a young Swedish music producer put a demo tape into the cassette deck of his Nissan Micra to listen to on his drive home. Before he got there, Denniz PoP knew he wasn't interested in producing the band, a bunch of unknowns called Ace of Base. But when he tried to remove the tape, it wouldn't come out. After two weeks of listening to the song on repeat, suddenly Denniz saw a way to make the tune work. That demo became 'All That She Wants' and its success led to Ace of Base's record becoming one of the best-selling debut albums ever. 'All That She Wants' heralded the arrival of a new type of hitmaker, the faceless teams behind the music who painstakingly craft tunes to tweak the brain's delight in melody, rhythm and repetition. John Seabrook visits the labs that build these hits, where teams assemble hook, bridge and chorus to infuriatingly catchy effect.