Most of them, honestly. Idk where you looked but Tidal, Amazon music, apple music, dezeer or however it's pronounced, all were available in Spain. I stocked with Tidal because of the Linux client but apparently theybalso pay artists the most so yay.
As an edit, you mentioned metal, I listen to lots of mainstream metal bands (powerwolf, system of a dawn, dragonforce, sonar arctica, blind guardian...), some other maybe not so well known ones (tyr, alestorm, korpiklaani), and some local ones that are more rock than metal (vendetta, su ta gar, kaotiko, la polla records).