Many grounds containing fervent supporters earn the right to be known as a Cauldron of Noise. No-one knows what a cauldron filled with noise sounds like, or why anyone has filled a cauldron with noise, or what this in any way has to do with a football ground. Before an extensive survey in 1986, commentators and journalists simply referred to it being 'very loud' or 'quite noisy', but the relentless march of science meant the sound had to be quantified.