Mastodon were so pleased with 2006's Blood Mountain that they didn't know if they were going to be able to top it. But Bill Kelliher is confident that their new album - as yet untitled but due 2009 - will do it. During a pre-show break, Kelliher checked in with MusicRadar to enthuse about the new record. "It'll mess you up completely. It's got balls, killer solos, the whole thing's insane. I don't know if the world is ready for it," says the guitarist. Listen the full interview here - but for more on Mastodon, as well as the best music news, reviews and tuition, head to www.musicradar.com.