A singer, or a group, takes to the stage with a playlist in mind and sometimes throws it out as soon as they feel the mood in the room. Or maybe they change their mind according to their own mood.
They need a repertoire of songs to perform. And the skills to perform them! They need presence to notice what people react to. And self awareness. They need confidence to take the audience on an emotional journey. They need people with them to support them, sometimes following, sometimes leading.
We all express our art differently. My art is facilitating. Not so different to other performers.