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

You didn't have to be a huge rock star; you just had to do well enough to continue doing what you wanted to do. It wasn't about hitting the jackpot, it was about sustainability.

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.

Critics and fans use the music of their youth as reference points. For years, people seriously wondered who "the next Beatles" were going to be, and classic rock bands were the de facto yardstick for rock quality.

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.

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.'

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.