Physicist Dr Helen Czerski, who presented BBC4’s fascinating series on colour (The Spectrum of Science), turns her attention to the amazing world of sound in this intriguing and accessible two-parter.

From beautiful music to the weird noises a tree creates, Dr Czerski examines what sound is, how it’s made and what it can tell us about our world. Tonight, Dr Czerski has a close encounter with Big Ben, and observes as Lesley Garrett sings inside an MRI scanner.