The BBC arts programme, Front Row, included an item of music from Julian Rowlands with the Santiago quartet, including bandoneon. They play a piece by Astor Piazolla (sorry if that is the wrong spelling). It includes a brief demonstration of how a bandonion works. This feature comes in about 19 minutes 36 seconds into the programme.
The bandoneon is a traditional Argentinian squeezebox and a key component in tango music. Virtuoso Julian Rowlands performs on the instrument alongside the Santiago Quartet and gives Stig Abell a lesson in how to play it.[end-quote].
This is a link to the program for anyone interested: