The bagpipes are a musical instrument. They are sometimes just called "pipes". They have a bag that holds air. The player keeps the bag full of air by blowing into it with a tube or pumping it with a bellows. To make music, the bag is pressed and the air comes out through a kind of flute or "chanter". There are usually one or more other tubes coming from the bag that make sounds whenever the bag is squeezed, called "drones". Each drone normally plays a different note, and stays on the same note the whole time it is playing, to play a harmony with the "chanter". The sounds are made by a single or, more commonly, double reed which vibrates when air is blown over it.