Great music few are aware of. Any genre.

How about:                                                       Celtic Frost - "Monotheist"                           Triptykon - "Melana Chasmata"                    Sleep - "Dopesmoker"                                 Great progressive metal recordings!

I don't know about "few are aware of" but contemporary folk on the Stockfish label.  Really well written and performed songs in absolutely reference sound.  All Stockfish recordings must be guitar based and boy can they record a guitar.  It's in the room!

Great to me; no idea how many are aware....

Rauelsson - Vora
Fabiano Araujo - Rheomusi
Eluvium - Copia
Helios - Unleft
Kuba Kapsa Ensemble - Vantdraught 10, Vol. 1
Takeshi Nishimoto - Lavendula
Rachel Grimes - The Clearing

The original Rockabilly artists, like The Rock 'n' Roll Trio (Johnny Burnette and his brother Dorsey, along with Telecaster guitarist Paul Burlinson, a favorite of Jeff Beck). There are hundreds of others, released on small, independent, regional labels in the mid-to-late 1950's. The original version of white Rock 'n' Roll, it's the blend of Jump Blues and Hillbilly.