Has anyone figured out the name of that "Swing Swing" song? Its been years :(

Nope.
I don't remember it.
I actually think it might be labeled as one of Soul's songs...like his black blood song или something. Insanity, maybe? I dunno.
My best guess~

Do Ты even know what 'swing swing' Музыка is...
It can be classified with anything including jazz and it is Ты inferior specimen, also the reason it's reffered to 'swing swing' is because the demons says 'swing swing' through half of the meetings soul has with him when listening to it.

It is jazz, yes however it is also свинг, качели music. So please die in an empty school grounds for some faculty members to find your rotting corpse.