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OK. Go here;
Sound Proofing Products
Depending on how much money he has to spend, there are different products with different levels of sound absorption abilities, as well as aesthetic and price variations.
The "Decorative Fabric Wrapped Panels" look the best, as far as appearance goes. I've seen them before. They're not cheap though, but if appearance is important, I'd go with them.

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The thing about money? It makes you do things that you don't want to do
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