Millions of Swifties and KatyCats—as well as Beliebers, Barbz, and Selenators, and the Rihanna Navy—would be stunned by the revelation that a handful of people, a crazily high percentage of them middle-aged Scandinavian men, write most of America’s pop hits. It is an open yet closely guarded secret, protected jealously by the labels and the performers themselves, whose identities are as carefully constructed as their songs and dances. The illusion of creative control is maintained by the fig leaf of a songwriting credit. The performer’s name will often appear in the list of songwriters, even if his or her contribution is negligible. (There’s a saying for this in the music industry: “Change a word, get a third.”) But almost no pop celebrities write their own hits. Too much is on the line for that, and being a global celebrity is a full-time job. It would be like Will Smith writing the next Independence Day.

Impressionable young fans would therefore do well to avoid John Seabrook’s The Song Machine, an immersive, reflective, and utterly satisfying examination of the business of popular music. It is a business as old as Stephen Foster, but never before has it been run so efficiently or dominated by so few. We have come to expect this type of consolidation from our banking, oil-and-gas, and health-care industries. But the same practices they rely on—ruthless digitization, outsourcing, focus-group brand testing, brute-force marketing—have been applied with tremendous success in pop, creating such profitable multinationals as Rihanna, Katy Perry, and Taylor Swift.

The music has evolved in step with these changes. A short-attention-span culture demands short-attention-span songs. The writers of Tin Pan Alley and Motown had to write only one killer hook to get a hit. Now you need a new high every seven seconds—the average length of time a listener will give a radio station before changing the channel. “It’s not enough to have one hook anymore,” Jay Brown, a co-founder of Jay Z’s Roc Nation label, tells Seabrook. “You’ve got to have a hook in the intro, a hook in the pre, a hook in the chorus, and a hook in the bridge, too.”

Sonically, the template has remained remarkably consistent since the Backstreet Boys, whose sound was created by Max Martin and his mentor, Denniz PoP, at PoP’s Cheiron Studios, in Stockholm. It was at Cheiron in the late ’90s that they developed the modern hit formula, a formula nearly as valuable as Coca-Cola’s. But it’s not a secret formula. Seabrook describes the pop sound this way: “ABBA’s pop chords and textures, Denniz PoP’s song structure and dynamics, ’80s arena rock’s big choruses, and early ’90s American R&B grooves.” The production quality is crucial, too. The music is manufactured to fill not headphones and home stereo systems but malls and football stadiums. It is a synthetic, mechanical sound “more captivating than the virtuosity of the musicians.” This is a metaphor, of course—there are no musicians anymore, at least not human ones. Every instrument is automated. Session musicians have gone extinct, and studio mixing boards remain only as retro, semi-ironic furniture.