How do you say what music do you like in french?

If you're talking to one person whom you know well (i.e. someone you can address as tu instead of vous): "Qu'est-ce que tu aimes comme musique ?"

If you're addressing several people, or someone you don't know that well (i.e. someone you must address as vous): "Qu'est-ce que vous aimez comme musique ?"