Wednesday - Sarah Walker
A selection of music including the Essential CD of the Week: Purcell Chamber Music performed by London Baroque
A daily brainteaser and performances by the Artists of the Week, the Gewandhaus Orchestra
In the week that marks the centenary of the birth of Alan Turing Sarah's guest is Dame Wendy Hall, a leading expert in computer science.
Sarah's Essential Choice
Vaughan Williams: Symphony No 5
Royal Liverpool Philharmonic Orchestra
Vernon Handley (conductor).