A viscera is the answer to this
A. Pitch
Cause Pitch is like a scale which is also like a level of a sound
Alright look, I am not 100% sure, but I am going to try to help you the best I can. I personally think it's in government archives because it would have been stored away there and would most likely be preserved so people can learn about it and it's origins.
Johann Sebastion Bach I think. Not very sure as I haven't touched music history in a while.