I just treated myself to a new portable recording device - the Zoom H4n Pro. I thought I'd try the multi-track recording capability (which is pretty easy to use so long as you don't try to read the crazy instructions) and turned an almost random book open at an almost random page, to find quite a nice little duet by G. F. Handel, arranged for two guitars by Fredick Noad.
One of the problems with guitar music is that it's written an octave above actual pitch, so on the concertina tends to be rather squeaky. However, the concertina sounds rather nice (like a clarinet) when pitch shifted down:
https://soundcloud.com/mrrowl/menuet-by-g-f-handel-concertina-duet
Here's the original for comparison:
https://soundcloud.com/mrrowl/menuetorigmenuet-by-g-f-handel-concertina-duet
And if you want to play along:
https://goo.gl/photos/MMMQj9cCX6mTwKgi6