Written By Mrs Bach, BBC Four, 8pm

Narrated by esteemed British composer Sally Beamish, this fascinating documentary takes as its starting point a theory about Johan Sebastian Bach's famous cello suites - that they might not have been written by him - and the observation that Bach's greatest works were written after he met his second wife, Anna Magdalena Wilcke. The man behind the theory is Professor Martin Jarvis, a musician as well as a forensic anthro-musicologist - in layman's terms it means he likes to pore over original manuscripts by people like Bach. It was while doing this that he started to take a deeper interest in why Anna Magdalena's handwriting also appears on the manuscripts. The documentary follows him as he travels from London to Paris and then on to Berlin in search of answers.

Dexy's: Nowhere Is Home, BBC Four, 10pm

In the spring of 2013, cult 1980s band Dexy's Midnight Runners took on a nine night residency at the Duke Of York's Theatre in London in which they presented, in theatrical form, their 2012 album One Day I'm Going To Soar, their first since 1985's Don't Stand Me Down. On hand to document it all were film-makers Kieren Evans and Paul Kelly and this feature-length concert film is the result. Intercutting the music are in-depth (and typically candid) interviews with Dexy's mainstays Kevin Rowland and Jim Paterson in which they talk about the troubles (too many) and triumphs (too few) of one of the UK's most consistently under-rated bands.