I don't think that cellose will assist in noise retention and it WILL SETTLE. So in time it will be compressed.
There is a sound board used by musicians that comes in 4 x 8 sheets that could go up on the walls that would help allot. But I doubt that the builder/owner will go for that extra expense.
I would think that a good alternative would be the compressed insulation wall boards that Tyvek produces.
You know, the noise will never be completely erradicated in any case. If he likes that loud crap music, then you are in trouble.
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