Attention (bugle call)
Encyclopedia
Attention 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...

sounded as a warning that troops are about to be called to attention.


This is taken from the British Alarm, at which call the troops turned out under arms.

Attention was also used for custom automobile horns in the 1930s and 1940s, and is most recognizable for that reason.)
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