How to find all 3 Green Rocks that play the music Easter Egg, Archangel by Elena Siegman, Malukah & Clark S. Nova in the Call of Duty Black Ops 2 Zombies map Origins.

There are 3 Rocks spread throughout Origins, the locations include:
1. Found near some crates in the room just off the Spawning room.
2. Found in the Workshop, Upstairs under some shelves.
3. Found in No Man's Land, near the sign for Excavation site beside some crates.

Once all 3 are activated the song Archangel by Elena Siegman, Malukah & Clark S. Nova will now play.