We delve inside the mind of Bach and examine one of his Chorales employing a Chorale melody and a Figured Bass. The video covers the meaning of the figures used alongside the bass line, after which there is a demonstration of how to play the Chorale in four parts by reading the Figured Bass, before going on to write in a possible harmonisation that accords with the figures. This video is useful for anyone wanting to study the Chorale harmonisations of Bach, for those wanting to understand how to realise Figured Bass and to those wanting to extend their skills in writing harmony.