Try looking for Nonesuch Explorer albums or Smithsonian Folkways etc. These are devoted to traditional foreign/ethnic music. Other labels cover the same material. Your local library may have a whole section of their CD collection devoted to this material. They may be filed under international music, or under folk music. Most of the Nonesuch Explorer LPs received 5 stars from the Rolling Stone guide back in the 80s. They have several Japanese releases, including orchestral Gakaku music, solo flute (shakuhachi)and koto.
