See my sibling comment. Yes, if the owner uploads somthing to yt and\or if the composition in public domain - it will be there. But that's it. For example you

See my sibling comment. Yes, if the owner uploads somthing to yt and\or if the composition in public domain - it will be there. But that's it. For example you have Netherlands Bach Society on Youtube. And I most likely can upload a rare Chaliapin's recording. But: - this one big "IF". - this won't work same way for some rare Michael Jackson composition, for example.