Episode 3/5. In 1705, the 20-year-old Johann Sebastian Bach set off from his home in Arnstadt to walk 250 miles to Lübeck, there to meet his hero, the composer and organist Dietrich Buxtehude. In the third of five "slow-radio" walks in which writer Horatio Clare searches for Bach's footsteps - and his ghost - the route takes us through the beeches of the Oderwald and on into the town of Wolfenbuttel.