Why is the musical scale the way it is: 12 keys: 7 major, 5 minor?

The reason why the musical scale is the way it is , with 1 2 keys and 7 major and 5 minor keys , is because of the way that the human ear and brain are struct ured . The musical scale is based on the natural frequencies of sound that the human ear is most sensitive to . \n \n The major and minor keys are the most commonly used keys in Western music , and they are the ones that are most closely related to the natural frequencies of sound . The major keys are based on the natural major scale , which has a specific pattern of whole and half steps that gives it a certain sound or feel . The minor keys are based on the natural minor scale , which has a different pattern of whole and half steps that gives it a different sound or feel . \n \n The 1 2 - key musical scale is based on the fact that the human ear is most sensitive to sounds that are within a certain range of frequencies . This range is known as the " just " or " equal " temper ament , and it is based on the fact that the human ear is most sensitive to sounds that are within a certain range of frequencies . \n \n The 7 major and 5 minor keys are the ones that are most closely related to the natural frequencies of sound , and they are the ones that are most commonly used in Western music . This is why the musical scale is the way it is , with 1 2 keys and 7 major and 5 minor keys . </s>