So I thought that it might be a good idea to be able to tag your songs localy, and then use the tags to find songs. Maybe in the f3 menu you can add an "Add song tag" option. Examples can be like: to-do, to-do-SS, to-do-FC, to-do-nofail etc. etc.
Already requested before iirc, but dont have time to look for the duplicate right now (I remember the OP even gave an example of adding the tag duck, coz the map had a duck on the background or something)