O Fortuna from Carmina Burana by Carl Orff.
Crazy Train by Ozzy Ozborne
The Patriots intro music is O' Fortuna, from Carmine Burana by Carl Orff, followed by Crazy Train by Ozzy Osbourne.
Carmine Burana and Crazy Train by Ozzie Osbourne see the link below
They come out to two songs -- first, the intro to Carmina Burana by Carl Orff followed by Crazy Train by Ozzy Osbourne.
Just before the Patriots take the field, the Patriots play the operatic piece Carmine Burana. When the team actually runs on the field they play Crazy Train by Ozzy Osborne. Click on the links below for vids of the intros.
Technically the Pats do not have a theme song. However If I were to tag one song as the Pats theme song it would be Crazy Train by Ozzy Osbourne.
I don't know ALL the music played at their games. But when the Patriots initially take the field they come on to the "Intro to Carmina Burana" by Carl Orff followed by "Crazy Train" by Ozzy Osbourne. Their touchdown song is "Elevation" by U2 and their field goal song is "Song 2" by Blur. I got my answers from the "Official New England Patriots Fan Zone" web page.
The song is Crazy Train by Ozzy Osbourne.