Music Discs (previously named Records) can be played in jukeboxes.
All music discs (except "11") can be obtained by getting a creeper to be killed by a skeleton's arrow.
Disc 11 : Redstone signal 11
Disc 11 : Listen a person running across and later on, stopping to use equipment of some kind, cough. The person struggling, and haunting background noises are heard throughout the recording.

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