These are room recordings of Pavlos Sidiropoulos released after his death.
He is alone with a guitar. The title says Blues but that's kinda what rembetiko is, the Greek blues. These recordings, Modern rembetiko you could name them..
This is a quite cool Spotify list
Ρεμπέτικα / Best of Greek Rebetiko · Playlist · 111 songs · 5.3K likes
open.spotify.com
And a box set of the patriarch, Markos
Enjoy