The most surprising and rewarding chapter to write was the Butthole Surfers chapter. I'd always thought of them as a bunch of drug-addled reprobates - which maybe they were - but it turned out to be more complicated than that.

I just wanted to tell the story of a bunch of musicians who had never had their story told before. There's no preaching or theorizing.

I really believe in the power of music - and I mean literally the power of musical tones - to rearrange the way you can think.

To begin with, the key principle of American indie rock wasn't a circumscribed musical style; it was the punk ethos of DIY, or do-it-yourself. The equation was simple: If punk was rebellious and DIY was rebellious, then doing it yourself was punk. 'Punk was about more than just starting a band,' former Minutemen bassist Mike Watt once said, 'it was about starting a label, it was about touring, it was about taking control. It was like songwriting; you just do it. You want a record, you pay the pressing plant. That's what it was all about.'

Bon Jovi's trick is to use heavy-metal chords and still sound absolutely safe. Rock & roll used to be rebellion disguised as commercialism; now so much of it is commercialism disguised as rebellion.

I'll leave it to other people to evaluate the legacy of my book, but I'm very moved when musicians tell me that they've been inspired by my book.

Nine Inch Nails' sound is dominated by clanging synths and sardonic, shrieking vocals.