On Mon, 18 Aug 2014 22:17:59 +0100, David C Brown <dcb.home@gmail.com>
wrote:
>No. An octave is an interval of seven notes.  A-B, B-C, C-D, DE, E-F, F-G,
>G-A. Seven notes.  So WTF is it called an octave?

http://en.wikipedia.org/wiki/Fence_post_error
They counted the tonic twice.

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