I’m tagging a lot of hymns performed by church choirs, basically anything that might be found in a church hymnal: SATB arrangements, music which might be “traditional” or “classical” or something else, often used with multiple lyrics, and lyrics which may be paired with multiple melodies, and equally esoteric sources: contemporary, “traditional”, scripture, translated from other languages. And lyrics and music weren’t necessarily written to go together, etc.
And there could be any combination of the above in a given album. This is the current example I’m dealing with: https://www.prestoclassical.co.uk/classical/products/8063177--abide-with-me-a-treasury-of-classic-hymns. Here’s another one I did a while back: https://beta.musicbrainz.org/release/c72d291b-65df-4fff-be90-81cddeb9b969
I always find myself scratching my head as to whether to treat these as classical or not, or if I’m going to decide track-by-track, how to approach that. The current example leans more heavily towards classical composers, but it would be nice to have a consistent approach.
Oh, yeah, and capitalization is a question, too. Hymn names are often written in sentence case rather than title case, and show up that way on the track lists.