Editing Scientific pitch notation (section)

==Scientific pitch versus scientific pitch ''notation''==
[[Scientific pitch]] is an absolute pitch ''standard'', first proposed in 1713 by French physicist [[Joseph Sauveur]]. It was defined so that all [[C (music)|Cs]] are integer powers of 2, with [[middle C]] (C<sub>4</sub>) at 256&nbsp;[[hertz]]. As already noted, it is not dependent upon, nor a part of scientific pitch ''notation'' described here. To avoid the confusion in names, scientific pitch is sometimes also called "Verdi tuning" or "philosophical pitch".

The current international pitch standard, using A<sub>4</sub> as exactly 440&nbsp;[[Hertz|Hz]], had been informally adopted by the music industry as far back as 1926, and [[A440 (pitch standard)|A440]] became the official international pitch standard in 1955. SPN is routinely used to designate pitch in this system. A<sub>4</sub> may be tuned to other frequencies under different tuning standards, and SPN octave designations still apply (ISO&nbsp;16).<ref>{{cite book | title = ISO 16:1975 Acoustics – Standard tuning frequency (Standard musical pitch) | publisher = International Organization for Standardization | year = 1975 | url = http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=3601 }}</ref>

With changes in [[concert pitch]] and the widespread adoption of A440 as a musical standard, new scientific frequency tables were published by the [[Acoustical Society of America]] in 1939, and adopted by the [[International Organization for Standardization]] in 1955. C<sub>0</sub>, which was exactly 16&nbsp;Hz under the scientific pitch standard, is now 16.35160&nbsp;Hz under the current international standard system.<ref name="JASA">{{Cite journal|first=Robert W.|last=Young|author-link=Robert W. Young|title=Terminology for Logarithmic Frequency Units|journal=[[Journal of the Acoustical Society of America]]|volume=11|issue=1|pages=134–000|year=1939|doi=10.1121/1.1916017|bibcode=1939ASAJ...11..134Y}}</ref>