Sharps and flats

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You can find every white key. The black ones are still nameless, and there are only five of them.

They do not get letters of their own. There are seven names and that is all there will ever be, so a black key is named by pointing at a white one and saying which way you moved.

That is the whole system, and it is why the same key ends up with two names.

Play with your computer keyboard too: Q W E R T Y U I O P is the left hand and Z X C V B N M , . / the right, an octave above, with sharps on the row above each.