I cannot now remember how or why I came to buy that album, I think I may have thought it was an interpretation of the hall of the mountain king. Whatever, it was a total enlightenment for me. Prior to that my tastes were classical and folk. "Pop" was mostly banal. This was something else entirely and I loved it. Released 54 years ago in 1969.
I never bought the album but always liked the song.
We had only one alternative/progressive/underground rock station growing up and they were always just one DJ away from losing their broadcast license. I first heard that song there and loved it.