For some people it may be Bach that sends shivers down the spine. For others it may be the Beatles. But no matter what our taste, most of us can tell when sounds form music. But how does our brain make sense of the information? Why do we like some kinds of music and not others, and what does our musical ability tell us about ourselves? Quentin Cooper finds out why music makes us so special. Producer Jonathan Rides EMAIL: material.world@bbc.co.uk