I think it's fascinating that different people work in different ways when it comes to writing creatively. For instance, I rarely have music on when I write. I find that music puts me in a certain mood, and I'd rather let the scene/character dictate that, than an outside stimulus, if that makes sense. I prefer to write in absolute, total silence, as that helps me imagine the setting for my RP much more vividly. If I have music playing, I can't hear the birds, the wheels of the peddler's cart, the howl of the wind. 

Another odd thing is that I generally have no idea of what voices sound like in my RP. I don't imagine voices for my characters, nor for anyone they interact with, beyond a vague "pleasant" or "deep" or "feminine". I wish I did. I'd love to hear their voices.