For my CLI homies, there's syncedlyrics.
Be advised: several Subsonic servers (including gonic and Navidrome) do not support lyric files unless they're embedded, and syncedlyrics will only put the lyrics in .lrc files. So getting lyrics in clients can be a two-step process: download the .lrc's, then run a script to embed them in the song files. I've seen a script to do the latter, but I haven't tried it. I'll send a patch to gonic to read lrc files, during the Christmas holiday most likely.