Great thread.
Here's a couple of songs that I think are pretty obscure that I just love. These date from the early 70's.
Caravan: Memory Lane/Hugh Headloss (from "For Girls Who Grow Plump In The Night"). The song is available on Qobuz on the Caravan Anthology album but the original album is not on Qobuz. The original album is one of my Desert Island Discs.
Savoy Brown: Ooh What a Feeling (from "Wire Fire"). Album out of print and not available on Qobuz but this song is available on YouTube. This is a great party album.