80's songs now with over 500million+ streams:

579,911,355: Run-DMC & Aerosmith - "Walk This Way" (single version)
528,549,678: Spandau Ballet - "True"
524,449,554: Bill Medley & Jennifer Warnes - "(I've Had) The Time of My Life"
518,927,218: Huey Lewis & The News - "The Power of Love"
500,488,393: Madonna - "La Isla Bonita"

Apologies, the Run-DMC song is somehow joined to the original Aerosmith track in terms of streams

Meanwhile, 70's songs now with over 500million+ streams:

515,578,392: Looking Glass - "Brandy (You're a Fine Girl)"
511,163,544: Ram Jam - "Black Betty"
508,212,345: The Hollies - "Long Cool Woman (In a Black Dress)"