One word...complex (it seems like two words...) First of all, you need to know that Japanese style means "Japanese style". You may be talking about the kind of Japanese traditional music. It has a wide range... including classical Japanese music, folk music, folk music, etc. The musical instruments are shamisen, shakuhachi, koto, etc. It's really hard to say about the melody, because Japanese music is really illogical. But there is reason to follow. It is originally derailed from world music (when I say derailed, I mean that it cannot be integrated, it is its own school). Melodically speaking, its basis is the fourth scale, the fourth. ..... Question 2 I really can't answer...