Let's see, music made by actual famous japanese musicians.
Super Locomotive - not sure if YMO guys actually worked on this, but the main theme is Raydeen.https://www.youtube.com/watch?v=lfX9tnHXX7s
Mother music was written by Keiichi Suzuki from Moonridershttps://www.youtube.com/watch?v=2w6siYk_Ge0
Sonic 1 and 2 music was by Masato Nakamura from Dreams Come Truehttps://www.youtube.com/watch?v=cDd_GlynA6A
There's probably more but those 3 are the first that come to mind.
The YMO and Moonrider guys have produced a ton of jpop/city pop/techno kayo during the 70s and 80s.