I don't know if this has been posted before, but I was playing a dance in New Jersey yesterday with my band Strumbow Squeezeblow and in attendance was the excellent Mike Agranoff who is an EC wizz. He joined the band for our final waltz... delightful! At the break, he was telling me about this project of his and sent me a link. I'm passing it on to you. Sounds great!
Here's a link to the 2-concertina transcription of the 3rd Brandenburg Concerto (1st Movement). http://www.mikeagranoff.com/audio/StraightLines/08-Brandenburg.mp3
The original is scored for 3 violins, 3 violas, 3 cellos, bass, and continuo. What I did was to take the violins and violas, and condense them into two concertina parts. So each concertina part is often playing two string lines, and very occasionally 3 parts simultaneously. Since in the original score the string lines are often doubling or laying out, almost every note Bach wrote is there in the transcription. I also created a simplified single cello line from the three written parts, which was played by a friend, Liz Cabrera. And Marco Brehm played the bass line! I don't know if you knew it, but Marco is quite an accomplished classical bassist. I also made a "music minus one" mix of the 2nd concertina part, bass, and cello, which allows me to perform the piece live on stage against the recorded other lines.
Mike Agranoff
www.MikeAgranoff.com