Let's add some fanmades
0 - Calliope
0.5 - Calliope II (I think that was it, not sure)
1 - Improbable Outset
1.5 - OMFG!!!
2 - Madness
3 - Hellclown
3.5 - Distant Chuckle (Expurgation but with chiptune, somebody actually made a FULL VERSION)
4 - Expurgation
5 - Reality Bender
6 - (Found a good one but don't know the song name)
My favorite is Reality Bender out of the mods and Expurgation out of the original songs