Um, for pure Japanese music, piano is probably better. I would like to recommend a few songs to you

1 Autumn Whispers

2 The Mark of the Rain

3The Truth that you leave

4Kikujiro's Summer

5 Castle in the Sky

They are all good, they are more gentle and rhythmic. It is recommended to listen to (Canon)

(Hope to adopt it, you can be promoted to level 2 if you adopt one)