Music by Kevin MacLeod (arranged by Daniel Butterfield). Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100861

MacLeod's description:

Genre: Unclassifiable
Length: 0:55
Instruments: Trumpet

Solo trumpet version of the 1862 military ceremonial piece.
ISRC: US-UAN-11-00861
Somber 2011