http://www.organimprovisation.com/twenty-ways-to-improvise-on-a-hymn/
Following a request for clarification on the blog post, I thought I'd do a few videos walking through at least some of the 20 ideas I proposed as ways to start improvising on a hymn. This video covers the basic skills of transposition and rearrangement of voices.
Part 1: Basics - #1-6 of the 20 ideas
Part 2: Reharmonizing - #7 & 8 - https://youtu.be/Zr9_4dWvD0Q
Part 3: Canons - #9 of 20 - https://youtu.be/4g86tWnTPqU
Recorded at the Cathedral of Mary Our Queen on 11 September 2017.
http://www.cathedralofmary.org/pipe-organ/