Once #211 is done: Navidrome already imports the Composer tag (id3: TCOM, MP4: @wrt, Vorbis: COMPOSER), and Composer Sort Order (TSOC, soco, COMPOSERSORT). So next step is to use it:

• Showing it in song details
• Indexing it for searching songs
• Showing songs under the Artist view, under a header (ie, Bob Dylan artist view has a list of his material under different headers: "albums" where he is the Album Artist, "compilation tracks" V/A compilation songs with him in the Artist field, and "compositions" with songs with him in the Composer field)
• A sub-section of Artists in the left-side menu column
• Maybe provide an extra folder level in Subsonic API when browsing by folder

Note: the Composer field can have multiple values

Thing with this is, currently there is no other streaming server that does classical music reasonably well. Plex, Emby, Jellyfin, AirSonic, funkwhale etc all don't do it. Roon does but you've probably seen their pricing...