Foo Fighters front-man Dave Grohl has collaborated with Ratt.  So, I guess it is true.  Dave Grohl will not stop until he plays with every band, in the history of the world.  The hair metal band, known for "Round and Round" and other songs (maybe) has been disbanding, reuniting, and going on hiatus for the last two decades.

But, now the lead singer and lead guitarist have recorded a song with Dave Grohl.  There is no time table for its release and the project is being referred to as "TBA."

Foo Fighters fans don't need to worry.  Grohl posted a blog on Foo's website thanking fans for their support of "Wasting Light' and the subsequent tour.  He also alluded to the fact that he's writing songs for their next album.  Foo Fighters is not going anywhere.  Dave Grohl is simply on a mission to play with every band, ever.  Apparently.