Heavy metal becoming increasingly political

updated 2:59 p.m. ET Aug. 10, 2006

SAN FRANCISCO - Heavy metal singer Chris Barnes didn’t know what people would think of “Amerika the Brutal,” an anti-war song he wrote after his cousin deployed to Iraq in 2003.

He heard a number of complaints — but also received supportive e-mails from American troops in the war zone.

“It kind of sent a shiver up my spine because those are the guys I didn’t want to offend by sounding anti-war,” said Barnes, vocalist for the death metal band Six Feet Under.

Other metal bands are finding similar inspiration.

Lamb of God’s albums criticize American foreign policy. Cattle Decapitation are ardent vegetarians who use explicit album covers and songs like “Veal and the Cult of Torture” to condemn the meat industry. Serj Tankian of System of a Down is co-founder of a nonprofit organization that works on social issues.

More than three decades after Black Sabbath conjured images of the dark arts, heavy metal is growing up. The genre is increasingly incorporating social and political messages into its dense power chords.

Cattle Decapitation vocalist Travis Ryan said his San Diego band’s mix of charging guitars and an animal rights message is drawing a diverse crowd that includes activists as well as traditional metal fans.

“We’ve always had a lot of crazy crossover going on,” he said before a recent show. “It’s a pretty diverse crowd we have. I’ve never known what to make of it.”

Twenty artists recently displayed art inspired by the band’s last album “Humanure,” in an online exhibit. Proceeds from sales of the art will be donated to animal rights causes.

Metal bands are also branching out into literature and mythology. Mastodon, which is headlining a summer tour with metal stalwart Slayer, patterned the concept album “Leviathan” around the story of Moby Dick. Death metal band Nile bases its songs and image around Egyptian mythology and iconography.

“Metal is expanding and evolving and becoming more diverse,” said Canadian anthropologist and filmmaker Sam Dunn, who directed “Metal: A Headbanger’s Journey,” released on DVD this summer. “It’s at a much more vibrant state than it was even five or 10 years ago.”

Dunn is working on a sequel to the film with the working title “Global Metal” which will trace the popularity of metal overseas, especially in developing countries like Brazil, Columbia and Indonesia.