[PaulHoule]

Believe it or not, Wikipedia.

Lately I did a burst of discovery around Japanese electronic music of the 1970s and 1980s such as Yellow Magic Orchestra, Isao Tomita and that in turn turned me on to the composer Claude Debussy.

[Dracophoenix]

Debussy is a common inspiration for many Japanese classical compositions (especially in anime). Maurice Ravel (of "Bolero" and "Pavane" fame) is another common one.

Since you mentioned Yellow Magic Orchestra, you likely know of Ryuichi Sakomoto. In case you were unaware, he has composed several movie and concert pieces for piano many of which were notably inspired by Ravel. One of my favorites is "Blu" (https://www.youtube.com/watch?v=pWI5aVKvkCg).

[hammyhavoc]

This is all big name and massively influential stuff though. I think op is asking how to find stuff before it is a household name.