Taps.

About Taps

Taps is a bugle call sounded to signal "lights out" at the end of a military day, and during patriotic memorial ceremonies and military funerals conducted by the United States Armed Forces. The official military version is played by a single bugle or trumpet, although other versions of the tune may be played in other contexts. It is also performed often at Girl Guide, Girl Scout, and Boy Scout meetings and camps. The tune is also sometimes known as "Butterfield's Lullaby", or by the first line of the lyric, "Day Is Done". The duration may vary to some extent.