Equinoxe 5 by Jean Michel Jarre, who won the Hawking Starmus medal! I remember being amazed by this music when I first heard it as a teen in 1986.
It was 1979 for me - 15 years old and in Mexico city staying with a family there (on an exchange) and hearing Oxygène on the tape deck in the car we were in...I have been a fan ever since. 👍