Mujitsu and Tairaku's Shakuhachi BBQ

Hello to all members. I´d like to know if someone have notation for shakuhachi and sho "Gagaku" duets or where to get to buy it. If is possible the Sho part in Western notation.

I´m looking for since long time ago some pieces as I´ve listened meanwhile I was in Japan. Is possible to get some Gagaku traditional music arrangement for those instruments? I´ve listened as well a contemporary piece composed by Toru Takemitsu to Gagaku orquestra. Thank you.