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.

The American indie underground made music for like-minded people who thought for themselves. Thinking for yourself is intrinsically subversive.

In eras past, mainstream culture was blandly, blindly complacent, so underground music was angry and dissatisfied. But now, mainstream culture isn’t complacent, it’s stupid and angry; underground culture reacts by becoming smarter, more serene. That’s not wimpy—it’s powerful and productive.

I'm always very careful to make the distinction between music criticism and music journalism. A lot of people don't. But criticism doesn't require reporting. You can write criticism at home in your underwear. On the other hand, journalism takes legwork - you have to get out there and see things and talk to people.

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

Back in the day, in '91 or so, I tried to interview Fugazi for Rolling Stone, which the band felt stood for everything they detested about corporate infiltration of music. They said, 'We'll do the interview if you give us a million dollars of cash in a suitcase.' Which was their way of saying no.

The online musical universe has become Balkanized, with many sites focusing on minute niches. That works well for reaching very specific demographics, which is wonderful for advertising, but it flies in the face of the common wisdom that people's tastes have become more diverse as music of any description has become a mouse-click away.