Fit Two:

I would think it highly likely that "dancing of a similar nature" would cover Sword Dancers and Rapper Dancers and Garland Dancers, as well as oddities like the Bacup Coconut Dancers. Quite how far it would stretch we still have to find out.

I would definitely think it should cover step dancers, such as in this tradition. Step dancers often play an instrument while dancing - and when they sit down to play they can be expected to continue to use their feet.

Any anyone who has ever seen La Bottine Souriante knows that the footwork of a seated musician can be a very central aspect of a performance.