The choral voices are there in support of a bunch of Da Vinci Code malarkey about secret codes that Bach supposedly was hiding throughout the music. I’m totally uninterested in this idea, whether or not it’s true, but I am intrigued by the possibility that Bach was quoting or adapting pieces of Lutheran chorale tunes. Morimur superimposes the chaconne with the chorales that it’s supposedly quoting. Who knows whether this was in Bach’s mind or not, but it sounds great — and ultimately, that’s the only thing that matters for music.
Picture the traditional scene of a “music creation team” in a studio — in attendance you may find the artist, the band, the manager, possibly the A&R rep of the label, the audio engineer, etc. Maybe you’ve hired a team of songwriters and curated a set of songs to record from their work. These roles are the traditional puzzle pieces required to produce good music.