This is second openculture list I've seen on HN recently, and when I visit the link, I may be dumb but I cannot see a list, playlist or anything corresponding the actual title of the post.
replies(1):
> Hear below Stockhausen’s “Kontact,” Henry’s “Astrologie,” and Bayle’s spare “Theatre d’Ombres” further down.
That seems unlikely to contain 476 tracks ... and nowhere do I see any actual list of tracks (other than the mention of 3 that you quoted).