Some might doubt the validity of this question for a non-chromatic intstrument like the GHB, but it is clear that most light music for the GHB is written in one of the nominal (as written) keys of A (with flattened 7th), D, or B minor. These approximate the standard keys of B-flat (with flattened 7th), E-flat, and C minor. Ceol Mhor (piobaireachd) is written in one of three pentatonic scales A (A, B, C-sharp, E, F-sharp, A), G (G, A, B, D, E, G, A), and D (A, B, D, E, F-sharp, A). Each of these scales can be used to give the effect of two or more keys.
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