TIT1
The 'Content group description' frame is used if the sound belongs to a larger category of sounds/music. For example, classical music is often sorted in different musical sections (e.g. "Piano Concerto", "Weather - Hurricane").
I'd like to use Grouping/TIT1 tag for designating the name of movie or game that a song is made for. For example, I want to find movie OST songs by the name of the movie.
I used to use album artist tag for this, but grouping tag is more appropriate.
MPD started supporting Grouping/TIT1 tag a while ago upon my request.
According to id3v2.4.0 frames,
According to Foobar2000:ID3 Tag Mapping - Hydrogenaudio Knowledgebase, TIT1 corresponds to grouping tag in vorbis comment.
I'd like to use Grouping/TIT1 tag for designating the name of movie or game that a song is made for. For example, I want to find movie OST songs by the name of the movie.
I used to use album artist tag for this, but grouping tag is more appropriate.