Recognising disc number in Poweramp Feature Requests Posted May 1, 2020 2 hours ago, andrewilley said: If a single disc has its own individual title within a boxed set, that would be considered as a subtitle to the album (box) title and would need its own tag. There is a little-used tag TSST in the most recent ID3 v2.4 spec which defines a Set Subtitle, but support for generating it is patchy at best (see https://www.blisshq.com/music-library-management-blog/2018/03/27/lamentable-state-disc-title-support/ ). AFAIK, Vorbis tagging doesn't officially support that sort of thing at all. Probably the simpler way to do it at the moment for maximum compatibility would be to give the disc its own appendix wording within the normal Title tag - e.g. the main album might be called something like "The Ultimate Collection" and a extra disc might be named "The Ultimate Collection: Bonus Unreleased Tracks". Andre Sure, but digital releases of many records have many disc #s and subtitles for each disc and as long as this is a common industry practice I think it is reasonable to expect that an app will recognise them or at least give the option to.