Placebo have been added to the bill of Rock Ness which takes place from June 12 to June 14 in Loch Ness in Dores, Scotland.The London-based alt trio will headline the final night of the Scottish festival (June 14). Other bands on the bill include Biffy Clyro and The Prodigy.Tickets are on sale now from www.aloud.com.Placebo will release their as-yet-untitled sixth studio album in June through the [PIAS] Entertainment Group.