Scion Rock Fest

The lineup for the sixth annual Scion Rock Fest has been unveiled. Among the 25 plus bands playing are headliners Machine Head and High on Fire along with Red Fang and Crowbar. The free event will be held at multiple venues in Pomona, Calif. on May 17.

Last week, a good portion of the 2013 Scion Rock Fest lineup was revealed, with the Melvins on the top line along with a mystery co-headliner. Now it's been revealed that thrash metal icons Testament will co-headline the hard rock and metal-leaning event in  Memphis, Tenn.

The Melvins and Municipal Waste are among the acts booking their tickets to Memphis in June to take part in the 2013 Scion Rock Fest. Though the full lineup has yet to be revealed, the Scion AV blog has unveiled a wealth of the bands taking part in this year's event.