WHAT IS THE MOST UNIQUE SONG THAT YOU HAVE EVER HEARD?

"Cantata de puentes amarillos" written by an Argentinian band, that a friend told me about, called Almendra.
https://www.youtube.com/watch?v=KTksi_VXGCk

Scraping Foetus Off the Wheel: "Enter the Exterminator".
The out-of-nowhere heavy metal riff off the Peer Gynt Suite by Edvard Grieg is a trip. One of the best from-high-to-low art syntheses you will ever hear.
From the album "Nail". AllMusic called it "possibly the best Foetus album [...] the sheer range of this music is hard to believe.
https://www.youtube.com/watch?v=B7_wJYvMB60

Scraping Foetus Off the Wheel: "Clothes Hoist"
From "Hole"
https://www.youtube.com/watch?v=nvAKJgsWVM4

For a unique song that sounds like no other,
How Soon Is Now- The Smiths.