According to a recent blog post from progressive metal band Intronaut, apparently Dave contributed drums two two tracks on a musical project with Justin:

Dave contributed drums to a song or two in a project with Justin Chancellor from Tool and a Polish guy named Peter. I’m a little afraid to try and describe the music, but it rules and kind of sounds like African techno with Polish lyrics. That’s actually not at all what it sounds like. Forget I said anything. It rules though! We’ve also been talking with these two characters about collaborating on a new Intronaut song.

Sounds intriguing!  Anyone have any idea who this Polish guy could be?

And here we were thinking that Justin’s done nothing but sit on his arse during the break.  Check out Intronaut’s music on their Myspace page.

Thanks to Lance for the tip!