When, years ago, a teenage Mitch discovered American comic songwriting legend Tom Lehrer, the course of his life was changed forever. Mitch looks at the legacy of the elusive Lehrer, the creative debt owed to him by all those who mix humour and melody, and performs some of the more Lehreresque of his own songs. Since Mr Lehrer (at time of writing, still slogging obstinately along at the age of 97) recently placed his entire catalogue in public domain, expect a few Mitch Benn-ified covers of some of Tom's most famous creations as well.