When a performance includes a relatively small amount of lyrics in another language, I would think that a comment is sufficient to handle the matter; however, if a performance includes a material amount of lyrics in another language....
Should that performance be treated as a medley or does a comment still suffice? If such a performance is not currently treated as a medley, is that an error (i.e. a rule) or is the situation handled per editor preference (i.e. a best practice)?
The performance that brought me here: Beyond the Sea …, which does not appear to be coded as a medley (but that could be a visualization issue).