Accordion: portable free reed instrument with a bellow.
Bellow: part that controls the air which makes the reed vibrate.
Bass register: buttons that plays the bass notes.
Bass button: system that transmits air from the bellow to the reeds, which produce the sound.
Treble keyboard: button that plays the treble notes.
Grill: place where circulate air and sound.
Treble register: buttons that plays the treble notes.