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<font face="Calibri">Supposing that I understand what you mean, this
is a very odd way to express it, to say the least. <br>
<br>
The only direct interval of a fifth in a harmonic series is that
between partials 2 and 3; it also exists between any pair of
partials multiple of these two, e.g. 4 and 6, 6 and 9, etc. Is
this the "second strongest group"? In what sense, "strongest"? And
what is a "group" within a harmonic spectrum? <br>
<br>
What you really mean, I suspect, is that the harmonic spectra of
sounds distant by an octave, a fifth, a fourth, a major third,
etc., in this order, are the most likey to attain some level of
fusion, In other terms, the harmonic spectra of fifth-related
sounds are the second most "fusionable" ones.<br>
<br>
You seem also to mean that the fusion of spectra related by an
octave is fundamentally different of that of sound related by a
fifth ("</font><font face="Calibri">Today there is a biology of
the octave. But there is no biology of the fifth.") <i>Natura non
facit saltus</i>: either there is a "biology" of none of them,
or a biology of all of them. But what do you mean by "biology",
here?<br>
<br>
Nicolas Meeùs<br>
Professeur émérite<br>
Université Paris-Sorbonne<br>
<a class="moz-txt-link-abbreviated" href="mailto:nicolas.meeus@scarlet.be">nicolas.meeus@scarlet.be</a><br>
<br>
<br>
</font>
<div class="moz-cite-prefix">Le 28/04/2014 12:59, Martin Braun a
écrit :<br>
</div>
<blockquote cite="mid:BB5492F110B040CE983C6DDC001362AE@Martin2014"
type="cite">the main reason may be that in harmonic sound spectra
the group of fifth-related partials is the second strongest group
after the group of octave-related partials.</blockquote>
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