I don't mean "add composer to the metadata", I mean add a field "primary artist key" which could have the value "composer", "performer", etc. How many fields a

I don't mean "add composer to the metadata", I mean add a field "primary artist key" which could have the value "composer", "performer", etc. How many fields are displayed is up to the UI, but having metadata to indicate what the most sensible field is would allow a simple UI like Spotify to just show that by default. Specifying on an individual level avoids trying to lump together genres and categorize which field matters most for each.