Foo Fighters frontman Dave Grohl has a history of being involved in multiple projects.
Just this year he has worked with:
• Fellow Foo Fighter Taylor Hawkins on Hawkins' upcoming side project "The Birds of Satan"
• Hardcore punk-metal supergroup Teenage Time Killers, and
• Los Angeles-based singer-songwriter Taylor Greenwood.
And, much to the relief of Foo Fighters fans who worried that the band might be breaking up, there's also a new Foo Fighters album in the works.