An accordion looks like it has a piano or a set of small buttons attached to a concertina, it creates sound by forcing air out through reeds which vibrate to create the sound. When the accordion bellows are moved faster, more air is forced out causing a louder sound to be produced.
Where are these instruments being played?
Is anyone else nearby?
How can you tell?
How are they making their sounds?
Describe how the vibrations were produced and then travelled to the microphone.