![]() ![]() ![]() This list of frequencies is for a theoretically ideal piano. For other tuning schemes, refer to musical tuning. To go from A 4 up three semitones to C 5 (a minor third), multiply 440 Hz three times by the twelfth root of two (or once by the fourth root of two, approximately 1.189207). To go from A 4 up two semitones (one whole tone) to B 4, multiply 440 twice by the twelfth root of two (or once by the sixth root of two, approximately 1.122462). For example, to get the frequency one semitone up from A 4 (A ♯ 4), multiply 440 Hz by the twelfth root of two. The frequency of a pitch is derived by multiplying (ascending) or dividing (descending) the frequency of the previous pitch by the twelfth root of two (approximately 1.059463). A jump from the lowest semitone to the highest semitone in one octave doubles the frequency (for example, the fifth A is 440 Hz and the sixth A is 880 Hz). Every octave is made of twelve steps called semitones. This is a list of the fundamental frequencies in Hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4), tuned to 440 Hz (referred to as A440). JSTOR ( December 2019) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Piano key frequencies" – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
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