When I was trying to specify appropriate metronomic specifications
for my edition of Bach's Suites for Cello solo, I measured some
recordings, e.g. by Schiff, Yo-Yo Ma, Maisky and others. I observed
deviations from factor 1.3 up to factor 2.2 for a single movement.
This is more than 2!
And if a whole suite is played by one player faster than by another
player then this does not mean, that all movements are played
faster by the first player. I measured e.g. following for Suite 2
"+" marking the fastest and "-" the slowest performance
Schiff 65+ 60- 89 39+ 120+ 62
Yo-Yo Ma 47 88+ 107+ 36 120+ 67+
Maisky 42- 76 73- 29- 92- 49-
-- Werner
