Overview: Broadcast of Prom 73: Sir András Schiff performs Bach’s The Well-Tempered Clavier After his extraordinary performance of Bach's Goldberg Variations at the 2015 Proms, world-renowned pianist Sir Andras Schiff returns to the Royal Albert Hall for another solo Bach recital. He performs Book One of Bach's The Well-Tempered Clavier, a cycle that he will complete next year with Book Two. Almost three centuries after Bach composed his two sequences of preludes and fugues in all 24 keys, 'the 48' remains a touchstone for all great pianists.