The human ear is sensitive to both the volume and frequency of sounds. |

Humans can hear frequencies from 20Hz to 20000Hz. |

Tones which have frequencies which are related by small rational ratios are perceived as being related. |

In music, tones which have frequencies which are a power of two apart are considered to be the same note in different octaves. |

In music, tones which have frequencies which are a power of two apart are considered to be the same note in different octaves. |

Each octave is split into 12 notes which are geometrically spaced within the octave. Given a musical note of frequency f, the frequency of the nth note above f is given by: |

This equation works for both positive an negative values on n. With n positive, you get notes above the starting note and for n negative we get notes below. |