@David Potts gets this right, IMHO. My quick math gets me 24-1/2 Hz for a low G. The low A, which is also the lowest note on a piano, a few Bosendorfer (sp?) instruments excepted, is 27.5 Hz.
I play piano, and sometimes, when I'm playing a standard and come to the end, I'll hit a lower octave of the tonic as the last note. I've found - this is not original, BTW - that, if the piano is bad enough, I can hit that low A and it will pass for a low _anything_, which is kind of cool but also testimony to how hard it is to make a musical instrument produce that pitch and then how hard it is to hear it.
-S-
I play piano, and sometimes, when I'm playing a standard and come to the end, I'll hit a lower octave of the tonic as the last note. I've found - this is not original, BTW - that, if the piano is bad enough, I can hit that low A and it will pass for a low _anything_, which is kind of cool but also testimony to how hard it is to make a musical instrument produce that pitch and then how hard it is to hear it.
-S-