What music do you use for concentration?
Selected Ambient Works
90s electronic, Autechre
https://en.m.wikipedia.org/wiki/Amber_(Autechre_album)
I love 90s electronic for concentration. But I've gotten into Tycho recently.
Tycho is great! Check out Emancipator as well!
Incunabula, their debut album as Autechre, is also fantastic:
https://en.m.wikipedia.org/wiki/Incunabula_(album)