As of 2014, sheet music for "Taps" for the trumpet can be found on the U.S. Army Music website. The sheet music is also available on the Wikipedia page for "Taps."
"Taps" is a musical piece for the trumpet or bugle that is played at military funerals. It sometimes goes by the names of "Butterfield's Lullaby" and "The Day is Done." The song is also often played at the close of Boy Scout, Girl Scout and Girl Guide meetings. It played at dusk to signify the end of the day. This musical piece has become the hallmark of most military funerals and memorial services in the United States.