I have played drums and guitar for 25 years and never “got into” music theory. I know what sounds good and play that but I never learned the names or theory behind it.
Why is a 5th not 5 notes apart? On a keyboard it’s any where from 4 white keysto 8 total keys? Why is there not uniformity or consistency?
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It is five scale steps apart. And when we notate music on the staff, a fifth spans an interval of five notes (inclusive).
A piano can play the scale in any tonality. Each tonality only uses 7 of the possible 12 equal-tempered pitch classes to form its scale. For example, the scale of G Major does not use c-sharp, but the scale of A Major does. G Major uses f-sharp, but C Major does not. You could build a keyboard with only white keys, but then you could only play music in C Major/a minor and the related modes.
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