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=USUAN1200082

MacLeod's description:

Time: 14:16 Genre: Contemporary
Electric Piano (EP), Synths

This is about as calming as you can get and still have some sound.
ISRC: USUAN1200082 Calming, Relaxed 2012