Philip Glass, Song IV from Songs for Solo Cello.
I’ve been doing a lot of nasty debugging lately and this is good for it.
Also helpful: Arvo Pärt’s Fratres.
Oh man this thing is going to be so much nicer for playing stuff on the stereo at nighttime when I’m cooking. It works really well and is super fun.
P.s. My little game is almost done and the first version will be free!