What is the name that plays boy singing in Pirates of Caribbean At End?

The song at the end of the Pirates of the Caribbean movies is "He's a Pirate", written by Klaus Badelt. While it's not explicitly stated who sings it, it's generally considered to be Klaus Badelt himself, as he often sings on his own compositions.

It's a powerful and iconic piece of music that perfectly captures the spirit of the Pirates of the Caribbean franchise.