How to Play the Song "115" on Kino Der Toten in Black Ops

In the starting round, go over to the sofa. Then turn towards the wall, and walk into it. Look down, and you should see the first rock. Press the action button to hear your character say something, confirming you have found the rock.

When you get to the room with the MP40 and Stakeout, open the downstairs door. Walk over to the mannequins, and look at the table. Crouch down, and you should see the second rock. Press the action button to hear your character say something, confirming you have found the rock.

This rock is without a doubt the hardest one to find. Go into the alley, and open the cage. Go straight to the back where the windows are and turn right. There is a tall piece of furniture that has shelf's on the right wall. You should see something that looks reddish. Press the action button to hear your character say something, confirming you have found the rock. If you found all the rocks, when you find the last one, your character should say something like, "I found the last rock!" The song should start soon after you find the last rock.