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=USUAN1100611

MacLeod's description:

Genre: Rock
Length: 3:06
Instruments: Guitar, Bass, Kit, Strings, Piano
Tempo: 60

Classic 50's/60's I, iv, IV, V chord progression as in "Unchained Melody" or "Sleepwalk". 024
ISRC: US-UAN-11-00611
Calming, Relaxed 2009