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'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.

I'm not sure I ever try to make a case for the music. I mean, sometimes the music isn't even that good. I just tell the band's stories; if I describe the music, it's to explain how it moved the overall story along.

I have this theory, bands with enigmatic lyrics attract crazies.

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.

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.'

Just as not all popular albums are wonderful, not all wonderful albums are popular.