This version of Pyramid Song by Radiohead is slowed down 800% and IMO it is amazing and beautiful.
https://www.youtube.com/watch?v=XiKWfcy-Z70
But then again, the source is an incredibly beautiful song which has an interesting time signature and chord progression:
https://www.youtube.com/watch?v=MdZSOoOF5Ms https://www.youtube.com/watch?v=SKMAV8pvlOA