The third chord in the Bach example on the wiki page should be analysed as ii[6/5] imo. The Mozart example comes p close to what the student piano H&S does!
The Goodman dong
― Sund4r, Tuesday, 24 March 2020 17:22 (four years ago) link
*song suggests H&S was already known as a piano duet in the early 70s. I still don't know where that came from. Was it included in a popular instructional book?
― Sund4r, Tuesday, 24 March 2020 17:23 (four years ago) link