The series in which readers answer other readers’ questions explores the sounds and music that play on repeat mentally – and how to escape their aural clutches

This week’s question: can you acquire courage?

I

know a song that’ll get on your nerves, get on your nerves, get on your nerves. I know a so … you get the gist! Why does a song sometimes get stuck in our heads? (And good luck stopping this one now!) Laura Ashton, Haslemere, Surrey

Send new questions to nq@theguardian.com.