Very simply, I'd like the option to sort by multiple delimited values in a single tag. For example, I have an artist called "Kadenza" in my library. Kadenza did a song collab with Charmer. Thus, I have two entries in my Artists list: "Kazenda", and "Kadenza & Charmer". Here's the tags for that song:
As you can see, there's a field for "Artists" which has the value "Kadenza / Charmer". What I'd like is the ability to leverage that field for sorting instead of just "Artist" or "Album Artist." That way, I can scroll through my library to find Kadenza, and all Kadenza songs will be there, or I could scroll to Charmer and find the track there as well.
It would also be nice to have the same for Genre. Again for example, I have songs with the tag "alternative / electronic". This feature would enable me to find those tracks under "alternative" and "electronic" instead of having situations where "alternative / electronic" is one genre and "electronic / alternative" is another.
I guess this may also imply the option to select a "priority" for tags, in case a song doesn't have that tag it'll move on to "album artist" then "artist", for example. A fully-factored version of this feature might look something like an "advanced sort options" menu, where users can enter custom tags and delimiters (slash, colon, semicolon, "and", etc). for different library screens/tabs. Honestly that would be a dream come true for me; I don't think any mainstream music players or libraries have anything like it.
