[Mrs. Don-o]

I am grateful!!

[YogicCowboy]

Yes. Leading tone usage and such were derived from his chorales. There is a 97% consistency in his resolutions, cadences, et cetera, and it sounds good.

Theory follows practice. He made it up, and now it is considered standard practice for major-minor “Classical” (really starting with Baroque) harmony.

Fortunately, some of his chikdren, Wolfgang Mozart, and especially Felix Mendelssohn, helped preserve what became the backbone of modern “serious” music. It could have easily been lost.