One of my favs is the album Romantic Warrior by Return to Forever.
Not really obsure, cuz they were pretty popular back in the day, but Blood, Sweat & Tears is another of my favs. They're kind of "obscure" now, simply because so few people play that music anymore.
There are a couple of tunes on the Frank Zappa album The Greatest Band You Never Heard In Your Life. Especially The Torture Never Stops parts 1 & 2. And they do a version of Stairway to Heaven That I like. The rest of the album I can take or leave, but the aforementioned tunes are outstanding.
There is a recording of Black Coffee that I've been looking for since 1998 & STILL haven't found. To me, that makes it "obscure." I know there are several artists who've recorded it, including Sarah Vaughan, Peggy Lee & Ella Fitzgerald, but I'm looking for a more contemporary recording.
Seems that the lovely female singing was a guest on the album of a saxaphone player, can't remember his name. What makes this particular recording unique is that there is no orchestral open and no piano in the arrangement; only that soulful sax & that sultry voice. I heard it on an NPR radio music show in 1998 & tried to contact NPR, the show producers, the show host & I got ZERO responses. I keep looking every now & then, but odds are not in favor of me finding it.
If this info rings a bell, let me know, OK?
Regards, GF.