Would it be possible to create here (via a Wiki capability), or elsewhere, a large editable document where we could compile a bibliography of documents and legislation on liturgical music for each episcopal conference internationally?

Yes, yes... I can hear it now... Supremacy of the Roman documents, local law not able to supplant universal law etc etc. All perfectly fine. I just think it would be interesting to track receptions/interpretations/implementations of the Roman documents in different national contexts.

I'd be delighted if anyone could recommend a thesis on this in the US context as well.