I suppose the problem is how to -
1)devise a course that can be taught from a text book by musicians who are not specialists in 'our' kind of music
2)set questions with answers that can be marked from a crib sheet.

If this is only a small part of the exam you can't expect experts teaching and marking, so if you invite more wide-ranging discussion the student might know more than them.

Good grief, we can't even agree among ourselves.

Maybe the whole attempt is as ludicrous as quiz questions which ask for the words of a nursery rhyme (as if there was only one version).