I found your interesting discussion about Graun. While Carl Heinrich is interesting for his Operas, in my opinion, Johann Gottlieb is at least for instrumental music even more interesting and at least more productive.
I just finished a little (70 min) digital realisation Project with seven Concertos of the Graun's to make more of the unknown music of those great brothers audible .
Most of them (GWV:B:XIII:66,90,155, GWV:C:XIII:45) are recorded for the first time as far as I know.
The older Brother
Johann Gottlieb Graun wrote pretty much concertos of which most of them seem not yet recorded. While he was an excellent Violinist who studied with Pisendel and Tartini, he also wrote a lot interesting concertos for winds like his Bassonconcertos, Concertos for Oboe, or for Alto-Recorder.
You can find Concertos for violin, for Recorder and Violin, for Oboe for Basson or for Harpsichord here:
http://klassik-resampled.de/jg-graunThe Concert was not that characteristic for
Carl Heinrich Graun who wrote beside his few Harpsichordconcerts much more Operas.
You can find two of his Harpsichordconcertos here:
http://klassik-resampled.de/ch-graunI hope you like it.
best
fahl5