The current tag type Scores featuring the ... should be renamed to Works featuring the ... (meaning: in their original verison).
Tags of the form Scores featuring the ... should also exist but should conceptually apply to actual scores (files), even though they would be tied to the work page for simplicity; the Scores featuring the ... tag could be automatically determined according to the following rules:
- Works featuring the XXX implies Scores featuring the ... only if the work has scores that are not arrangements
- arrangements for instrument XXX would be included under Scores featuring the XXX
The switch can be done fully automatically immediately, no re-tagging should be needed.
(To avoid visual cluster, let users decide whether they want to see one or the other set of tags (or both) on workpages and in the Category Walker.)
Simpler (and perhaps less intuitive) alternative:
technically, keep the current tags. However, add a new category Pages with arrangements only. That would allow users to exclude such pages from their searches when they want to filter for workpages that actually really contain scores featuring a particular instrument. (Again, it should be possible to compute the new tag automatically. The current tag Pages with arrangements is not sufficient for this purpose, because filtering it out removes also pages that have original verisons next to arrangements.)