Sietze de Vries - IMPROVISING video 05 | choral prelude 1

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1. Introduction to the main organ of the Church House (originally Marten Eertman, 1906 / Rebuilt in Baroque style by different organ builders, including Bernhardt Edskes, Winold van der Putten and Sander Booij.
2. How to make a choral prelude with the use of repeating chords and a ritornello (interlude).
I'm using the melody of (Genevan) Psalm 93.