I just noticed that the Lyrics plugin fails to fetch lyrics to CHVRCHΞS songs because the artist name contains a Greek uppercase Xi (Ξ), whereas musixmatch.com and lyrics.wikia.com URLs are presumably limited to ASCII characters.
One solution would be for the Lyrics plugin to cycle through the artist’s MuzicBrainz aliases if it hits a 404 error.
That’s a reasonable idea! We already do something similar for special cases, such as turning dashes into hyphens. Using aliases would be a good idea too. Would you mind opening a GitHub issue for a feature request?
I will gladly open a GitHub issue for it tomorrow, but beyond that I’m not yet familiar with either Python or beets.
EDIT: Here it is: https://github.com/beetbox/beets/issues/3340