"Reveille" is a bugle call, trumpet call or pipes call most often associated with the military or summer camp; it is chiefly used to wake military personnel at sunrise. The name comes from "réveillé" (or "réveil"), the French word for "wake up".
British Army Cavalry and Royal Horse Artillery Regiments sound a call different from the Infantry version shown below also known as Reveille (Trumpet & Bugle Calls for the British Army 1966), while the Scottish Regiments of the British Army sound a pipes call of the same name.
Read more about Reveille: Commonwealth of Nations and The United States, Germany, India, Ireland, Sweden, Boy Scouts of America