Wes Crone wrote:

>As far as I have learned through my own studies:
>Chaconne: Common harmonic sequence throughout.
>Passacaglia: common melody throughout; usually in the bass but not always.
>Ground: Unwavering bass line, never changes; music changes above it.

This would make Bach's organ Passacaglia a Ground.  Are you suggesting that
Bach got it wrong? ;-)

Jonathan