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=USUAN1100819

MacLeod's description:

Genre: Soundtrack
Length: 4:01
Instruments: Music Box
Tempo: 89

Ragtime-like music box theme with an unexpected-sounding bridge section.
ISRC: US-UAN-11-00819
Bright, Calming, Mystical 2011