Maybe because of sickness or work problems,
maybe family emergency.
If I wanted to regain what I have achieved in organ practice,
I would simply go through the old practice process
that I've done before - you know my routine -
work in small fragments, slow tempo, separate voices at first,
then all two-part and three-part combinations
before playing entire four-part texture.
If I had mastered this piece before,
now the process of practice will take fewer repetitions,
hence I will get results faster
than learning from scratch.
(Thanks to Lvov)
Modulation from Bb Major to Eb Major: I-V65-I=V-V7-vi-IV65+-I64-V-V7-I-IV64-IV64--I