Anyone know this tune?

The video below is from the band Dream Theater and Peruvian Skies is my favorite song from them. They like to jam out in concert and do a lot of pieces from other bands and mix them into their own songs. There is a piece starting at around the 8 min mark that I do not recognize and I own almost all of Dream Theaters albums.

I hope one of you guys can recognize it as its a pretty rad riff and jam. It might just be that a jam but maybe not..