Currently Broadcast Wave files (BWF Files) are a commonly used format for audio preservation. If using BWF as your preservation format, there are some guidelines and tools available to help your metadata adhere to current common practices.
For guidlines on metadata for Broadcast Wave files, see the FADGI guidelines.
Examples of BWF Metadata from Puget Sound and Vision.
Puget Sound and Vision's bash scripts to aid with BFW metadata embedding.