Like the jam-band fans they probably loathe, heavy-metal fans have created their own self-contained musical world, big enough to support bands as extreme as this one.

He attracts easygoing jam-band fans.

This is a band that doesn't seem to want to break out of its self-imposed mandate, which is to make pleasant grooves for jam-band fans.

Expect spacey, abstract jams and bubbly, Meters-derived funk, along with a popular costume: postcollegiate jam-band fan.

On the other are baggy, shaggy jam-band fans.

But by imposing restrictions, it will also encourage jam-band fans - a particularly Internet-savvy demographic - to circumvent those restrictions, finding the soundboard recordings through unofficial channels.

The Yonder Mountain String Band has tailored virtuosic bluegrass to jam-band fans.

But until the band shouted the full title, the jam-band fans didn't pick up the joke.

Soulive harks back to the meat-and-potatoes keyboard trios of bygone decades, mixing funk and jazz for an audience that, increasingly, comes from the ranks of jam-band fans.

He did his best to kill time between acts, although he learned the hard way how impatient jam-band fans can be.