Thank you, I will use your advice.
A bit different, but related case: what to do with the record’s “Artist” property when performers are not known? I do not have the CD, and the person who originally entered the information provided just track names, but that’s all. According to the style guide, the record artist should normally reference the performer, but currently record artist references a composer. What to do?
(1) Let composer stay as the record artist (ignore violation of the style guide)
(2) Use [unknown] artist for the track.
A variation on the above from your example: performers are known for the whole release, but it is not known which performer contributed to which record, so we can’t properly set performer / record relationship. How to set the record artist in such case?