自然七度(しぜんななど、再生ⓘ)とは、周波数比が正確に7:4[2](約969セント)の音程である。「七の短七度」(septimal minor seventh)[3][4] または「下短七度」(subminor seventh)[5][6][7]と呼ぶこともある[8]。「一般的な」[9]の純正短七度(周波数比9:5[10]、約1017.596セント、これは平均律での比25⁄6:1、1000セントと非常に近い)よりもやや狭く、「より美しい質の」音程である。自然七度は第7倍音と第4倍音(基音の2オクターブ上)の間の音程であるため、倍音列に由来していると考えられる。
Bosanquet, Robert Holford Macdowall (1876). An elementary treatise on musical intervals and temperament, pp. 41-42. Diapason Press; Houten, The Netherlands. ISBN 90-70907-12-7.
"On Certain Novel Aspects of Harmony", p.119. Eustace J. Breakspeare. Proceedings of the Musical Association, 13th Sess., (1886 - 1887), pp. 113-131. Published by: Oxford University Press on behalf of the Royal Musical Association.
"The Heritage of Greece in Music", p.89. Wilfrid Perrett. Proceedings of the Musical Association, 58th Sess., (1931 - 1932), pp. 85-103. Published by: Oxford University Press on behalf of the Royal Musical Association.
Douglas Keislar; Easley Blackwood; John Eaton; Lou Harrison; Ben Johnston; Joel Mandelbaum;William Schottstaedt. p.193. "Six American Composers on Nonstandard Tunnings", Perspectives of New Music, Vol. 29, No. 1. (Winter, 1991), pp. 176-211.
Fonville, John. "Ben Johnston's Extended Just Intonation: A Guide for Interpreters", Perspectives of New Music, Vol. 29, No. 2 (Summer, 1991), pp. 106-137.
"On Some Points in the Harmony of Perfect Consonances", p.153. R. H. M. Bosanquet. Proceedings of the Musical Association, 3rd Sess., (1876 - 1877), pp. 145-153. Published by: Oxford University Press on behalf of the Royal Musical Association.
Mathieu, W.A. (1997). Harmonic Experience, pp. 318-319. Inner Traditions International; Rochester, Vermont. ISBN 0-89281-560-4.
Hewitt, Michael. The Tonal Phoenix: A Study of Tonal Progression Through the Prime Numbers Three, Five and Seven. Orpheus-Verlag 2000. ISBN 978-3922626961.
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