Sticky Songs

What makes snippets of popular songs go round and round in our heads? Which songs are likely to be earworms or 'sticky songs' and what sort of person is most susceptible to them? If an earworm is driving you mad, how do you get rid of it? And what might the wider mental health benefits be of understanding where the mind goes when we let it off the leash?(Image: Teenager listening to CD’s with headphones on)