The tour is expected to run until Sept. 11, and a fourth main-stage act will be added to the roster before the kick-off date, according to a spokesperson, who said that organizers are also hammering out plans for a second stage with additional acts.

3DD is backing its latest album, "Seventeen Days," which surfaced in early February. The set--which features the cut "Let Me Go"--moved about 231,000 copies during its first week in stores, earning it a No. 1 debut on The Billboard 200 album chart.

The group is in the midst of a spring tour of the U.S., and will spend most of June working the European festival circuit. Details about the U.S. run are included below, while information about the Euro outing is posted at the band's website.

Staind has nailed down Aug. 9 as the release date for its next album, "Chapter V."

Breaking Benjamin continues to back last year's "We Are Not Alone," which debuted at No. 20 on The Billboard 200.