Let it never be said that Dave Grohl is content to rest on his laurels. While the Foo Fighters frontman has been spending the majority of the spring and summer on the road with his band in support of last year's excellent LP 'Concrete and Gold' - including a doubleheader at Chicago's Wrigley Field this past week - he has announced a new project born out of one of the most challenging performance of his career in 'Play.