Here’s a jig that I made up on Max, my bass concertina. Take it steady and play it as low as you can. Composed Oct 2016.
Click on the image – you should be able to see it full size. Version 1 is written in the bass clef, suitable for double-bass and other low instrument players:
… and here it is again in the treble clef. Note sure why it’s smaller – maybe because small things sound higher? 😉