15 best reality singing show performances (The Voice, Idol, X-Factor, Got Talent)

Yes, I know, I should be working on a review of Steven Pinker's 500+ page epic Enlightenment Now. And I am. Really. However, I got a bit distracted. Significantly distracted, in fact. So much so that instead I present to you a countdown of my favourite 15 reality singing show performances. Sorry, I'm genuinely not sure …