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=USUAN1200010

MacLeod's description:

Genre: Electronica
Length: 1:16
Instruments: Synths
Tempo: 178

Simple simple 8-bit theme. This is the fastest "Boss Level" version of the three. It was originally written by a puppet, so mostly black keys, which are easier for a puppet to play.

ISRC: USUAN1200010 Bouncy, Bright, Humorous 2012