So I recently created something rather crazy if I don’t say so myself:
A proper full-on audio format called flo™.
It’s really cool, check it out on GitHub: https://github.com/flo-audio/flo
This uses the reflo and libflo libraries from that to create a all encompassing and powerful metadata editor.
The UI is taken from another project (ID3Editor (same idea (powerful metadata editor) but for mp3’s).