SRD: I found the US Catalog of Copyright entries with a search of Google Books.

I didn't find the information from the British Library with Google (or any other search engine); I went directly to the British Library web site and used their search. It was either here:
British Library Integrated Catalogue Search
or here:
British Library Sound Archive Catalogue Search
--but, oddly, I can't get it to work to find the same information again.

There's lots of information out there that can't be found with Google. By years of experience I have learned some good places to look.