LP and Disturbed? HOLY SH*T

One question...I haven't bought this yet, but I've been through the DVD bin at the CD store in the mall here at least once a week looking for it, I saw it there once, and lately it hasn't been turning up...
But, my question is, what is David Draiman's role in the DVD? Disturbed is one of my favorite bands along with Linkin Park, and personally, if they were to ever go on tour together, I would tail their bus the whole way. So yeah, what's he doin there? I know him and Chester both did songs for Queen of the Damned, is that why?

I'm paralyzed! The monkey shot me in the ass...and...paralyzed me! Oh, sweet irony!