there are too many to mention so i'm asking the asker to tell me two letters, one for the first letter of the artist and one for the first letter for the song... and a year. Mind you though that i listen to mostly 80s stuff so say a year between 1980-1989 :-)
The second was the first real electronic song I'd ever heard. I've listened to a ton of electronic ever since. Its light, airy, and graceful. I'd never heard a similar track before and it's probably still my favorite.
I like so many songs, can't pick just one. When I was a teenager I could tell you in a second what song was my favorite, because I got stuck in a particular genre and a particular band, now I see things more broadly and it's impossible to answer this question.