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

My Ding-a-Ling Chuck Berry

https://youtu.be/XXhsqsh1uX0

I think "strange" is a better descriptor than unique, but, I kind of find Klaus Nomi covers to be interesting,  Take a look at this version of "Just One Look":

https://www.youtube.com/watch?v=2yplwTe5IFQ

Theodora is Dozing - from the Bulgarian State Women's Choir - a really unusual tune that is just indescribably beautiful. I think David Byrne did a cover version since this was one on one of those classic Folkways World music records. All of those were just the greatest way to travel the world through a record player. 

Warren Zevon - Werewolves of London. So damn catchy too.
More seriously, anything by Laurie Anderson is 'out there'.

Quite a few that made me stop and think over the years.

'Desolation Row' by Dylan. Just drowning in images.

'The End' by the Doors. Will he go there? Yes he will.

'Sister Ray' by the Velvets. Wtf?

'Her Majesty' by the Beatles. Where did that come from?

'My Mummy's Dead' by the John Lennon/Plastic Ono Band. Oh dear!