The copyright office does not try to collect and preserve, en masse, old recordings from before they started taking deposits of audio recordings for copyright registration. (1972 prob? sound recordings didn't have federal copyright protection in the USA before 1972) There is no my knowledge no legislation authorizing that or funding from the government for it.
The Lib of Congress (probably not in the copyright office part of it) does have some historical audio recordings in their collection, including digitizations, but I don't think on this scale.
The copyright office does not try to collect and preserve, en masse, old recordings from before they started taking deposits of audio recordings for copyright registration. (1972 prob? sound recordings didn't have federal copyright protection in the USA before 1972) There is no my knowledge no legislation authorizing that or funding from the government for it.
The Lib of Congress (probably not in the copyright office part of it) does have some historical audio recordings in their collection, including digitizations, but I don't think on this scale.