Choralvorspiel BWV711 "Allein Gott in der Höh' sei Ehr"

Here we are dealing with a so-called "bicinum".
A bicinium is a mostly vocal composition for two voices, from which the duet and the duet developed. Today, the term is also used more for all Renaissance and Baroque music set for two singing voices or instruments.
While unaccompanied duets are rare in modern music, older a cappella composition uses biciniums quite frequently, especially in Germany, the Netherlands and Italy, where the pedagogical value of biciniums was quickly recognised.
The term bicinium first appears in an essay by Jan z Lublina in 1540. Biciniums were used as a teaching tool for music and for the psalms, usually with two students performing, rarely student and teacher. This is described by Martin Luther, and so many biciniums are also part of Protestant hymns.

Well, I've been practising the piece diligently since yesterday and have managed to play it reasonably well, largely without mistakes. But it didn't meet my strict requirements, so I had to re-edit the recording and increase the tempo a little - and so I have to declare the piece as MIDI, although I played it more than 90% live ..... never mind.

The last bars were a bit strange, so I added a little cadenza, I hope the great JSB will forgive me for this intervention!