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| | Encyclopedia of Musical Topics -Harmony - (Site not responding. Last check: 2007-10-13) |
 | | Notes may be considered to be in harmony with each other when some of the harmonics of each note, especially the louder harmonics (which are often the lower ones), share the same frequency (with a small margin of error). |
 | | Some traditions of music performance, composition, and theory have specific rules of harmony, typically amounting to a simplified description of harmonics and resonances, which will be more or less appropriate depending on the instrument(s) to which they are applied. |
 | | For much of the history of western classical music, including the common practice period, the conventions and rules of harmony were strictly enforced, often by the controlling influence of the Church, while folk music and non-Western music also developed often widely different notions of harmony. |
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