"Supper’s Ready" by Genesis
I hate to be that guy. But the state of present day rock is pretty bad if Supper’s Ready is considered obscure.
But I am not that guy, since there is an ongoing supply of great modern music.
But as a huge fan of prog, I can go way more obscure.
Since most prog bands did not have writing hits, or radio friendly songs, as a goal, the vast majority of prog, present and past, is obscure,
Back in the 70’s, prog rock from Italy was considered equal in quality, based purely on the quality of the music, so the list of brilliant obscure prog from Italy is long and deep.
Premniata Forneria Marconi - Dove...Quando, Impressioni di Settembre, Per un Amico
Banco del Mutuo Socorrso - Canto Nomade Per Un Prigioniero Politico, Metamorfosi
Arti e Mestieri - Articolazioni
I could seriously list dozens more Italian prog songs, that are the equal or near the equal of most of their Brit contemporaries.
And that is not even going into prog from France, Spain, the US, Japan, Canada, Poland, that was also at an extremely high level.
More current stuff:
Pain of Salvation - The Perfect Elemnt, Beyond the Pale, Inside Out / near brilliant Swedish prog-metal.
Riverside - Egoist Hedonist, Second Life Syndrome, Deprived (Irretrievably Lost Imagination) / Great Polish prog/prog-metal band.
Steve Wilson - The Raven That Refused to Sing, Luminol, Raider II