Musicbox samples from my Patreon Reward pack 23 in elf audio Koala Sampler.
Starting point is a simple recording of a music box that plays Jingle Bells. It's on the first sample pad. The other samples are either glitches or recording noises and some were pitched down and stretched in an audio editor.
I created the sequence with Koala sampler step editor and I am playing Koala's FXs in realtime over the sequence. Original performance was over 9 minutes long, I have edited it to this shorter version.