Hi William,
Yes, it sounds unbelievable that story, but it is true. The part of the boring sermon is my version but it might have been true as well. It is a very interesting booklet with highly unusual melodies from that era. It offers 4 pieces for harpsichord as well (origin unknown so far).
Actually the finding of such a source is not rare in our region. So far, I collected some 3000 pieces from the late 18th century in Flanders, but a great many have been stolen and collected by Napoleon's army. Most of these are kept in the archives of the Paris Opera now. Most of them were dances and airs for the bourgeois peopleand nobility just before the French Revolution (1789). Most of the sources and manuscripts disappeared after the revolution and were rediscovered at the end of the 19th century and used as original folk dances as some kind of romantic nationalist reflex. It appeared later that this was a mistake, because most of them were not Flemish, but French or even Austrian, from famous and less famous opera and ballet composers. We speak here about dances such as menuets, contradances, quadrilles, cottillons, waltzes, tambourins, matelottes and even olders dances such as rigaudons, passepieds, allemandes...
Here's an example of such a dance, taken from Mozart's "Zauberflöte". It was mentioned as
"Walsch La Douce Flûte"
It was performed by my chamber orchestra in 1998. I did the arrangement before I discovered that it was one of Mozart's masterpieces. That's why it sounds pretty different. As usual, only a melody line was provided.
Best regards,
Max