For 1990, I'm following the "songs in alphabetical order" format.
First up is "Baby's Coming Back" by Jellyfish.
When I discovered the internet in the mid 90s, I discovered that there were people who hated Jellyfish and people who loved them. I'm in the like don't love camp, except for this song, which I love and think is absolutely brilliant.
Even this cover by McFly (mostly lame UK boy band) is okay.