Der Eisendrache: Opera Music Easter Egg! (Call Of Duty: Black Ops 3 Zombies)

How to activate the hidden opera song on Der Eisendrache!

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THEMED MUSIC
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ZOMBIES I: http://goo.gl/YuDgE6
ZOMBIES II: http://goo.gl/aqAFvN
ZOMBIES III: http://goo.gl/Qc1bNU
EXTINCTION: http://goo.gl/Bq5E9A
BORDERLANDS 3 SONG: http://goo.gl/u664S4
AMENSIA (AMFP) SONG: https://goo.gl/rrqPuq
TITANFALL SONG: http://goo.gl/VSPuwO
FALLOUT 4 SONG: https://goo.gl/yJEHwn
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