How to Use Mutations in Baroque and Romantic Organ Music?

Rien Schalkwijk, Friend of SOP and very prolific youtuber organist friend asked me a question about how to use mutations (stops, like 2 2/3 or 1 3/5 etc.) in music from the Baroque times. And how is it different from Romantic period? This video tutorial is for Rien (and others who might be wondering about the same things).

Visit Rien's channel:
https://www.youtube.com/c/RienSchalkwijk