Words Get Under Your Skin Like Needles, so Let Me be the Doctor

Let's be honest: music needs its labels. If you think about it, rock is built around guitars, punk is built around lfs (loud, fast, short), and emo is built around emotions. Why then is there this arguement that music should be labeled? This is inspired by my last poll, where I'm getting bashed about emo. PS> Why do people only get upset when we label emo music emo?

I'm not asking which band you love the most; I'm asking which is the most emo. They're all emo, but I need to know! The results are going to be used for a quiz and the top six or seven are going to be used.