Greetings, esteemed members of HPSCHD-L.
First, let me say, I'm not sure I'm using the correct term here: tessitura.  It sounds very impressive, but some sources seem to indicate it might mean something slightly different than what I am after.  I am hoping someone can point me to a simple chart or other source, indicating the full range of pitches necessary to play all of the keyboard works of J S Bach, especially; and hopefully also those of other significant composers from that era.  I think I've read that the range for Bach is GG..d''', but now that I'm looking, I'm having trouble confirming that.  Surely there must be a definitive source somewhere?

Thanks as always for any light that you can shed.
--Benjamin

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