When an aspiring singer and the 19-year-old daughter of a musician friend of mine mentioned that she had never spent a penny on music in her entire life, I stopped what I was doing to listen. She quickly followed with the remark that she rarely listens to any song for more than 9 seconds unless its “really really good”. Her remark released a murmuration. I considered 9 seconds. Is it really possible to recognise a song and pass judgement on it in just 9 seconds?