Why are a piano’s black keys arranged in groups of three and two?
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Imagine you have a big box of crayons. You want to draw a rainbow, but you only have seven colors: red, orange, yellow, green, blue, indigo and violet. You can use these colors to make a nice rainbow, but you can also mix them to make other colors. For example, if you mix red and yellow, you get orange. If you mix blue and yellow, you get green. If you mix red and blue, you get purple.
Now imagine you have a piano. A piano is like a big box of musical crayons. You can use the white keys to play seven different notes: C, D, E, F, G, A and B. These notes are like the colors of the rainbow. You can use them to make nice melodies, but you can also mix them to make other notes. For example, if you play C and E together, you get a note that sounds like C but higher. This note is called C sharp. If you play D and F together, you get a note that sounds like D but higher. This note is called D sharp.
The black keys on the piano are like the mixed notes. They are called sharps or flats depending on how you use them. For example, C sharp is also called D flat because it is between C and D. The black keys are arranged in groups of three and two because they follow a pattern. The pattern is: two white keys, one black key, three white keys, two black keys. This pattern repeats all over the piano. It helps you find the notes you want to play and make different sounds.
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