I love ost as of late -this video is what I currently listening to: Hiroyuki Sawano Epic Anime music
I suggest these two as well
Amatsuki covers a RADWIMPS song.
Astronomical observation (BUMP OF CHICKEN COVER) Natsuyo Takaaki You should check out RADWIMPS, BUMP OF CHICKEN, LUCK LIFE, OLDCODEX, granrodeo,and Aimer.
I am not so good with Kpop but.. ah these guys? DOPE by BTS
Also - Hello ; )