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Those codes where introduced some 20+ years ago for id3v1:https://en.wikipedia.org/wiki/List_of_ID3v1_GenresSo some of your genre tags are populated with these numbers and not with the genre names, and MusicBee is displaying that as-is.Your previous music player probably had some 'auto-translate to text' function for it.So all you need to do is change these numerical values in your mp3 files to actual genre names.