A girl suddenly sends a voice to sing to you. What should she say?

I think if a girl suddenly sends a voice to sing to herself, it is very likely that this girl has ideas about herself or has a good impression on herself.

So in this case, you must ask your heart in time to see if you have the same love or other feelings for each other. If you have, you can reply to him directly and say that you sing really well. If you have no idea about the other person, you can reply directly that you have something to do and talk to him later.