Dave Grohl is a vocal fan of surreal Swedish metal act Ghost B.C., and even worked with them as a drummer and producer to record an ABBA cover in January.
What we didn't know is that the recording wasn't limited to just one song, and that they've been sitting on a pile of cover tracks which will be released later this year.
Speaking backstage at Hellfest festival, one go Ghost's nameless ghouls told Riff Mag (via Metal Insider) that some of the hidden tracks are already out in the wild, with more to follow on an official release later this year:
"We released 'I'm a Marionette' for the first single, and on the Japanese version we have a Depeche Mode cover. We have a few more flying around that we did with Dave Grohl that we're going to release by the end of the year, I think, as some sort of EP or single," he said.
The ghoul adds that they haven't quite decided on what format the cover release will take. "It needs to be a purposeful release," he said. "We're trying to get an angle of what to do with it. There are a few more songs we're waiting to do."
Listen to the full interview, where they discuss everything from Dave Grohl to Star Wars, in this audio clip: