I'm going to ask a subway performer to stop singing
Why would you ask them to stop singing?
This woman is singing too much and what she's singing is just horrible, it doesn't even sound like a tune.
Well, I still think that you should just keep walking. It is rude to interrupt a performance, regardless of where it is at.
I'm going to make a scene in front of all those people.
It's mean to make a scene when someone is just trying to make a living. Just ignore it, it's not a big deal.