I've always labelled those notes in parenthesis in the Album field, like your final example. I do wish it had a separate field.
The biggest pain point I have with ID3 tags is how compilations are handled, particularly when that compo is a DJ mix with individual tracks. I prefer to not have these pop up in searches unless I specifically want to listen to the whole album, so I've taken to setting the genre to "Mixed / Drum & Bass", for example. (I usually queue up music by the genre tag.) I also like to separate tracks with vocals vs purely instrumental, so those guys get "/ Vocal" appended.
iMusic on iPhone handles both cases poorly. It is sad that they are letting that app essentially rot.
The biggest pain point I have with ID3 tags is how compilations are handled, particularly when that compo is a DJ mix with individual tracks. I prefer to not have these pop up in searches unless I specifically want to listen to the whole album, so I've taken to setting the genre to "Mixed / Drum & Bass", for example. (I usually queue up music by the genre tag.) I also like to separate tracks with vocals vs purely instrumental, so those guys get "/ Vocal" appended.
iMusic on iPhone handles both cases poorly. It is sad that they are letting that app essentially rot.
I wish there was a better way.