How to listen to the music in zombies.

[Dark-Monkey14]

I don't know if you guys know but there is a way to hear the music... In Kino Der Toten you need to look for three rocks and then you'll hear the music...  In the map FIVE you'll need to look for three red phone and then press square on the phone and the  rocks...

[P3NuXz0R]

These are all the songs that were in maps before, Few from WaW but idk if they still might be around here..

[F4T4L_0wnag3]

I heard music when i got to round 15 in kino butafter that round it stopped