kinda weird example of this phenomenon, but I was skimming this kikrokos lp (cerrone/kongas rel.) and heard this little moment that pretty much blew me away. recorded in '78, this sounds like a techno/house beat that coulda been produced last year- made with entirely analogue synths! there's a ton of examples, but this one started me thinking.
take a listen:what are some other examples of songs (not even necessarily good ones) that sounded out the future. Silver Apples comes to mind, so does Jean-Jacques Perrey, and James Brown.