What is this man doing?

What is this man doing outside at a shopping centre?

From his outfit, he might be a performer from the Taiwanese native group or from the Philippines. I do not know, for I just passed him by for he and his partner were preparing for a performance.

Half an hour later, the duo were performing for the passer-by. At a distance, the music emanated from their instruments seemed Filippino. I am not sure what cause they were advocating for there was no banner or poster behind them as clues.