If there is a lesson that can be omitted from this unit–and I realized this the minute I began its preparation–it is this third lesson, on the Medieval Troubadours. Yes they are part of the global oral tradition, but in a highly peculiar way. For instance, they used the Occitan language, which is now endangered. Their songs were born of the chivalric tradition and celebrate courtly love. This is a long way of saying that this material may not be of surpassing interest to teenagers.
In any event, I open this lesson with this Cultural Literacy worksheet on the concept of a capella singing. Here is the reading and questions on the troubadours themselves, which is the principal work of this lesson.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.