Hi! I know shamisen was involved in koto music and I’m wandering if has anyone played sankyoku…
Yes, I have played sankyoku. I have played it in the current version of koto-jiuta shamisen-shakuhachi and also the older version of koto-jiuta shamisen-kokyu.
I think kokyu is a very rare instrument and the players can be counted in one hand…
Sakura, I think you are totally correct. [wink]
What a coincidence 
When I write about kokyu, I saw a post about kokyu players… I think some composers will pay attention to kokyu, making somewhat different than only sankyoku