"First Call," “Reveille,” and “Taps,” Military Bugle Calls 

Bugle calls are musical signals that announce particular events or times of day in military settings. Naturally, the far-reaching, loud sound of trumpets and bugles are ideal for communicating on a battlefield or in military camps. You will notice that all bugle calls feature exclusively the notes of a single triad; this is because a bugle, which has no valves, can only play a very limited number of pitches.