Some of the japanese songs that i like is not in spotify. I'm kinda sad, but if nothing can be done like due to difficulty to obtain the original song, then I understand, but if possible, add more japanese songs. It will also benefit spotify because it will capture a lot of j-pop and anime lover.
I agree with you, there is a lot of Japanese music missing which I found surprising. Apparently many people have to personally write individual messages through a specifc process to request the artists. Then eventually, maybe, Spotify will listen. I think it's unfortunate because I listen to a lot of music from anime via Pandora, so I don't know why this seems so uncommon.