Music by Kevin MacLeod (original composer: unknown). Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100688

MacLeod's description:

Genre: Classical
Length: 1:01
Instruments: Horn, Trombones, Tuba, Trumpets

Yo, Heave Ho! The classic theme of difficult drudgery. Based on a Russian folk song. 036
ISRC: US-UAN-11-00688
Calming, Dark, Somber 2010