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The Challenge: Make musical instruments

How are musical notes measured?

Musical notes are conventionally measured on a scale from A - G with middle C usually being used as a reference note. The scale is repeated over all 88 keys on a piano, all 6 strings of a guitar, etc. The distance from one 'C' to the next 'C' is called an octave and in each octave the higher C has a frequency that is twice the frequency of the lower C. This shows that there is a scientific formula behind what we naturally find pleasing to our ears.

Keyboard showing middle C