Store the lyrics source url differently

[f1reflyyyylmao]

Since some time now I have a media player that will display the embedded lyrics from music files. I think it is very weird that the lyrics of beet-tagged files include the lyrics source url in the lyrics field itself. In my mind, the lyrics field is for user-facing information and should not have this metadata.

The two obvious solutions would be to

1. Not write the source at all
2. Write the source into its own tag

When making this configurable, the old behaviour could of course be kept as an option, totalling three available variants of lyrics source storage.

Thoughts about this?

[ghb-x]

I like the idea of making this configurable (at least switching on / off).
Regarding "Write the source into its own tag": I have no idea how to standardize something like this. Can beets just come up with new tags, like LYRICS_SOURCE?

[f1reflyyyylmao]

I think that anyone can just invent new tags however they please. on/off would suffice for me personally as well.

[pbnoxious]

You can generate new beets fields as you want.
For tagging in the files: most modern standarts allow arbitrary fields (e.g. id3v2 or vorbis-comment), but some old (e.g. id3v1 for mp3) do not.