Why don't girls play guitar?
When a child utters the words "I want to play the drums", even the most musically-minded parent's heart must sink a little at the thought of all that, well, noise.
But the more peaceful households are those with girls because they prefer the harp or flute while boys go for electric guitar and drums, according to a report by the Institute of Education.
Many instruments learnt in schools are dominated by one sex or the other, says the study which examined the provision of music for five to 16-year-olds in every local authority in England and Wales.
Only one in 10 school harpists and flautists are male, while the electric and bass guitars are enjoyed overwhelmingly by boys.
There are many reasons why strides made in bringing equality to other areas, such as school sports, have not reached the music room, says Professor Sue Hallam, co-author of the report.
"I think that over a long period of time, these kinds of ideas about what is suitable for children to play, or adults to play, have been around for so long we've internalised it," she says.