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→Wolf Intervals
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The A{{b}} - E{{b}} interval above is called a '''Wolf Fifthwolf fifth''', a very noticeable divergence from the desired ratio - it "howls", with noticeable ''beating'' between the notes. For the above tuning scheme, this interval is present in 6 of the 12 major/natural minor keys based on each note of the 12-tone scale.
Depending on the tuning scheme, intervals other than the perfect fifth may also deviate widely from the pure tuning ratio, creating a dissonant harmony. These are often called '''wolf intervals'''. They may be present in every key rather than just a subset of those possible based on the 12-tones.