That Mitchell and Webb Sound is a comedy sketch show on BBC Radio 4 which started on 28 August 2003.
The series is seen in some ways as a follow-up to The Mitchell and Webb Situation, a sketch show shown on Play UK in 2001.
That Mitchell and Webb Sound returned to BBC Radio 4 for a fourth series in 2009, the first episode broadcasting on 25 August 2009.
The cast includes frequent Mitchell and Webb collaborators James Bachman and Olivia Colman.
These include Jesse Armstrong and Sam Bain (the writers of Peep Show, in which Mitchell and Webb star), Mark Evans, David Quantick, Jonathan Dryden Taylor, Toby Davies, Simon Kane and John Finnemore.