I'm not entirely sure but I believe it's German, the reason why it has rotary valves and is played with the left hand is because he had not fully formed fingers.
@@elliotharrington5632 Thanks Elliot. The keys on a rotary valve tuba are still operated by the right hand although the left hand can be utilised for the pulling and pushing of slides which is necessary on account of these instruments not having a compensating system. Hats off to the player for finding a way to perform at this level.
