The wonderful research tool that is Spotify strikes again. Whilst attempting to listen to some harmless flute concertos by Emmanuel Bach Spotify decided I really should hear a newly released recording of two of his so-called "inauguration cantatas" (available here). Except I only realized this after looking in shock to see what was being played - a somewhat jazzed up and German version of the "Et Vitam Venturi" section of the Credo of Zelenka's Missa Circumcisionis (ZWV 11). This turned out to be the the opening chorus of the first cantata on the disc "Ich will dem Herrn lobsingen" (H.821b) which was written in 1771, over 40 years after ZWV 11. Of course it is well known that Emmanuel Bach had a copy of ZWV 11 in his collection. However, I find nothing written anywhere (forgive me Bach/Zelenka scholars if this is long trodden territory!) about Bach actually parodying Zelenka's music in his own work (it is known he did this with other composers, especially Benda and of course papa JS).
Anyway, I thought I would post this because the disc is brand new (and very nice by the way) and is an interesting (and rare) opportunity to hear another composer's take on Zelenka. Bach's manuscript can also be seen online here. It seems that Zelenka's already quite energetic violin part was not snazzy enough for the tastes of the 1770s so Bach sends it into hyperdrive. He also ditches the horns and greatly expands the roles of Zelenka's 3 trumpets. The chorus and continuo seems to be pretty much identical to Zelenka, with the words and underlay changed to accommodate the German text of course.
One wonders what might have happened had CPE Bach had his hands on ZWV 19-21...