On BBC Radio 4 Extra this afternoon. Available on BBC Sounds now.

The Physicist's Guide to the Orchestra

"In 1945, Benjamin Britten wrote The Young Person's Guide to the Orchestra, showing off the instruments of the orchestra in a short film.

Viewers are taken through each section of the orchestra accompanied by a narration which describes the different sound quality of instruments:

'Clarinets ... make a beautifully smooth, mellow sound', flutes have a 'sweet voice' and the oboe has a 'plaintive quality.'

Trevor Cox looks at the physics behind the way orchestral instruments produce their unique sound.

How is the sound produced, and how much does the material from which the instrument is made affect the sound?

Trevor Cox is Professor of Acoustic Engineering at the University of Salford.

He talks to scientists who have studied musical instruments:

* David Sharp from the Open University
* Mike Newton at Edinburgh University
* Jim Woodhouse of Cambridge University

Members of the BBC Philharmonic provide the players' perspective.

Producer: Nick Holmes

An R&M North production for BBC Radio 4, first broadcast in December 2012."