Prelude & Fugue No.18 in E minor BWV.548 (2) Johann Sebastian Bach Download 'Prelude & Fugue No.18 in E minor BWV.548 (2)' on iTunes
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In 1747, Bach visited the court of Frederick the Great at Potsdam. The musical king played a theme for Bach and challenged him to improvise a fugue based on his theme. Bach improvised a three-part fugue on one of Frederick's fortepianos and later presented the king with ‘A Musical Offering’ which consists of fugues, canons and a trio based on the theme.