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=USUAN1100236

MacLeod's description:

Genre: Soundtrack
Length: 2:45
Instruments: Small Ensemble - Harp

Harp "duet"... where the harps never actually play together. Impromptu 020
ISRC: US-UAN-11-00236
Dark, Calming, Eerie 2005