Music by Kevin MacLeod. Available under the Creative Commons Attribution 3.0 Unported license. Download link: https://incompetech.com/music/royalty-free/index.html?isrc=USUAN1100758

MacLeod's description:

Genre: Contemporary
Length: 15:55
Instruments: Tuba, French Horns, Marimba

Very long, very calming piece in D Flat major. Part two of a series of three.
ISRC: US-UAN-11-00758
Calming, Relaxed 2010