It looks like someone already made one of these for a notes field, so only the second feature is relevant.
You must have some method of attaching information to tracks other than writing to the ID3 tags because you’re able to store the key and BPM of streaming tracks. So I propose you add a writable field for notes. Most of the tracks that I like to mix change time signatures at some point in the track. If I had some way of noting the starting and ending time signatures, it would help immensely. This could be a field called something like “notes.”
Also, the “queue” interface is quite clunky. I’d suggest creating a new data type called “sets” or something like that which would be savable by the user. This would also give you a place to store the field mentioned above.
