Thanks a lot! Happy New Year, too.

I think that the tracker and mediaplayer and such use libid3tag0, so would be neat to have something based on this.

I tried to install something from Debian repositories

id3 0.15-3 An ID3 Tag Editor
ii id3v2 0.1.12-2 A command line id3v2 tag editor
ii libid3-3.8.3c2a 3.8.3-13 A library for manipulating ID3v1 and ID3v2 tags
ii libid3-tools 3.8.3-15 ID3 Tag Library: Utilities

One of the difficulties I encountered was related to non-ASCII metadata.

Thank you. Good day, good night, and good luck.