Here’s some Takemitsu for you:
Rain Spell, one of his most beautiful works IMHO.
ありがとう for making this post, I’m slowly listening to what catches my eyes more, see if my ears are catched too 
This is probably my favourite japanese song:
The video is amazing, but you can also find a version with on-screen lyrics in both kanji, romaji and english.
上を向いて歩こう has already been mentioned, I’d like to recomend a cover by Chu Kosaka I’m really hooked to:
another Japanese artist I’ve been following for many years now is Hiromi, I’ve had the chance to see her live twice and I can only say: SAIKOU DESHOOOUUU 
This song has a wonderful Final Fantasy vibe!
I could go on for a very long post here just sharing artists and songs with you guys, I’ll leave just one more, an occult 90’s band that got somehow famous over the internet in the last years, mostly on music specialized forums (reddit/mu) and pages like RyM and the like. It’s Fishmans. If you have 40 minutes to listen to something I encourage you to listen to this one 40 minutes jam, it’s a wondrous mindbending trip. If you don’t have such patience or time or whatever, just look them up, all their other songs are shorter
I’ve been digging the following lately
[Alexandros]
RADWIMPS
COOL JOKE
Mashiro Ayano
SUPER BREAVER
My favorite song so far. It sounds so catchy
I am a huge fan of ずっと真夜中でいいのに。Every song of theirs is a banger!
Though 「勘冴えて悔しいわ」is by far my favorite.
Currently listening to this one:
Got a nice beat, it’s addictive in a certain way
If you’ve not listened to そのいのち by Kaho Nakamura would strongly recommend!!
When you combine great music with more great music:
I really like Japanese music, i know it’s really ignorant but before all I heard was anime music so i didn’t know what else there was and I kind of thought thats all there was 
it really motivates me to learn more when i find more and more songs i enjoy
Yuki no Hana would have to be my all time favourite song. I just really love listening to it, regardless of what version it may be. I have a lot of memories with that song. Also I would like to add my favorite poker music playlist whenever I play online I always tune in to will smiths chill beats during this pandemic season which I cannot wait to be over.
I am a huge fan of Kajiura Yuki so anything from her I guess. I also like a decent number of aimer songs, if you meant music itself aside from Kajiura Yuki, Yokoyama Masaru, Matsutani Suguru and Sawano Hiroyuki are among my favs as well.
Example of Kajiura
I am a HUGE fan of Amazarashi. Surprised to see not a lot of people know about him. I don’t know why but I could listen to any song made by him just because of his voice. Give it a listen 
Nirvana Sun, the new album from 勝手にしやがれ, just got added to Spotify. I’m planning on listening to it when I can.
This song もぐもぐYummy was trending the other day. The video has the best pixel art I have ever seen, and I was an SNES kid.
One of my new favorites from Asian Kung-Fu Generation:
I know, I know, the song itself isn’t exactly new
Asian Kung-Fu Generation is great ^^
I’ve been listening to 水中それは苦しい and モーモールルギャバン
This song is really good、モーモールルギャバン - ユキちゃん
Not my favorite per say but NercyTalkie makes good music and their music videos are usually in the style of lyric videos so it’s nice to be able to read along while watching the MV.
Also I’ll +1 to people who brought up Asian Kung-Fu Generation, Kana-boon, and Frederic.
I’ll add UVERworld, Keytalk, Hoshino Gen, Shishido Kavka, Akiyama Kiro to the list.
Definitely Ichiko Aoba. One of the best guitarist+vocalist combination artist of all time, she has this very soothing voice and simple yet gorgeous instrumentation that hooked me on first listen of her songs. She has a lot of acoustic albums in her discography (qp is my favorite), and some great live albums too, however her newest album shows her moving to a more Shoegaze direction with whimsical and vibrant production matched with her heavenly voice. I’d recommend listening to her single Porcelain to start:
A classic… 
Also, because I couldn’t help myself
Ahhh!!! I’m so happy!! Soooo haaaaapppyyyyyyyyy!!!
( T - T)-b
(he got me through some tough times!)
Re: Ken Ishii – is he still going?
Möbius Strip (2019) ← from his wikipedia article
Seems he is!! 
Very glad – need to see if I can dredge up some youtoobs to hear what his current sound is…