Adjutant's Call
Encyclopedia
Adjutant's Call is a bugle call
Bugle call
A bugle call is a short tune, originating as a military signal announcing scheduled and certain non-scheduled events on a military installation, battlefield, or ship. Historically, bugles, drums, and other loud musical instruments were used for clear communication in the noise and confusion of a...

 indicating that the adjutant
Adjutant
Adjutant is a military rank or appointment. In some armies, including most English-speaking ones, it is an officer who assists a more senior officer, while in other armies, especially Francophone ones, it is an NCO , normally corresponding roughly to a Staff Sergeant or Warrant Officer.An Adjutant...

is about to form the guard, battalion, or regiment.)
The top staff is for the Bugler, while the lower staff is for the Drums and the Cymbals.
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