Aus tiefer Not, Choral variations improvised in style of J.S.Bach

How to improvise choral variations in Baroque style? This demonstration video clarifies the main musical, compositional and psychological elements involved in Baroque-style improvisation at the organ. <br />Choral theme: Aus tiefer not. <br />1. Harmonising the theme <br />2. Variation 1: duetto <br />3. Variation 2: organo pleno - theme in bass <br />4. Variation 3: Trio - theme in alto <br />5. Variation 4: Trio - theme in tenor <br />6. Variation 5: Three part Fuga