Aside from my favorite heavy metal album of the decade, Slayer's Reign in Blood, not much happened musically in 1986 that captivated my interest. Wait, I just remembered. Don Johnson released Heartbeat that year. 1986 is the greatest year in music history.
Slayer's "Angel of Death" wasn't the only great song of 1986, despite my lukewarm feelings toward this particular year. "Pink Frost" by the Chills is worth anyone's time. So is this pajama jammy jam by one of my favorite bands in music history, Sonic Youth. "Expressway to Yr Skull" aka "Madonna, Sean, and Me." Ask your great-grandparents about that alternate song title, youth of today.
Alternate choice: The Go-Betweens - "Twin Layers of Lightning"
This is some beautiful, mysterious stuff. An underrated band with two wonderful songwriters who played off each other's strengths and minimized each other's weaknesses.