I had the game paused for a while as I was doing something else and I suddenly found myself singing Rod Stewarts Rhythm of My Heart and realized it was because it was coming from the game.  If it wasn't supposed to be that song then it was uncannily similar. 
 
I thought I recognized another song or two last night but forgot what I thought they were.   I'm sure there is a list out there somewhere (perhaps in the manual even) with them but I honestly didn't bother to put any effort into looking for it.  Anyone else recognize any of these songs?  

Well every psychopath battle, and the credits, has a Celldweller song playing. I don't recognise many of the original soundtrack any further than some of them being taken from Dead Rising 1. Even some of the stores have the exact same style, like the cosmetic salons and Shanks.

If the psycho song is the same from Case Zero it's an instrumental version of Celldweller's The Best It's Gonna Get.

There's an intro to a song in the Americana Casino that sounds very close to an ACDC song, but changes just before they would of had to pay loyalties.

" @Vorbis: I hadn't caught the potential ACDC song until just now.  In the Americana Casino back by the BBQ place (with the plane over the tables).  At only hearing it briefly I would say it might have been Thunderstruck. "