The last couple of days I've been listening to Incubus's "The Odyssey." The first movement of this 4 movement work was composed for the Halo 2 soundtrack and very much sounds exactly like what you would expect on the Halo 2 soundtrack, but once the second movement starts it breaks into a full-on Progressive Rock boogie-woogie. The third movement pulls jazz elements into it, then manages to channel Pink Floyd, and the fourth movement starts with a double-drumming harmony that moves into some classic Incubus rock, and then from there a disharmonious guitar channels some Godspeed You! Black Emperor. There's some Nine Inch Nails inspired sound (stuff reminescent of "The Warmth" among others) thrown in as well for good measure.
I first listened to this years ago after Halo 2 came out. I was generally a fan of Incubus and a big fan of bands like Pink Floyd and Dream Theater. This was just so different than anything else I'd listened to by Incubus, it quickly became a favorite. Hadn't listened to it in years.
Especially movements 3 and 4 are truly something to listen to if you're into jam-session style Prog rock.