Verify Physical Format Specifications — Verify Physical Format Specifications

The Library of Congress maintains specific quality criteria for physical sound recordings submitted for copyright registration. These physical formats include compact discs, vinyl discs, open-reel tapes, cartridge tapes, and cassette tapes, ranked in order of quality.

When researchers study physical releases, understanding these formats helps them identify the highest quality editions available. Accessing these official physical deposits can provide a reliable reference for analyzing disputed audio.