Copyright Aid

First of all, thank you so much for taking your time to compose such a thorough answer, it's cleared a lot to me. The music to which he skates will be absolutely important in this film, i.e. he actually cannot dance to another piece of music, since he already has the whole choreography worked out ...

Hello,
I'm making a documentary about a 12-year old figure skater. He already has the whole choreography worked out for a certain tune, and he will perform it in state championship. Can my filming his performance to that song be considered as incidental inclusion, or not - since I know months ahead ...