Historical classical music recordings

The latter can be of rather high quality if the recording derives from tapes made and archived by the broadcaster or the organization mounting the performance.

Important sources of historical recordings are the broadcast archives of orchestras and opera companies.

For instance, the Met Opera of New York has issued a number of historical broadcast recordings which are only available upon making a donation.

Many blogs, clubs, internet groups and other forums exist whose members contribute and receive ROIOs, many of which have never been available commercially.

Historic recordings that begin as freely traded ROIOs often surface later as commercial products.