Editing String instrument (section)

===Length===
[[File:Proportional string fingering.png|thumb|200px|right|String fingering is proportional and not fixed,<ref>[[Walter Piston|Piston, Walter]] (1955). ''Orchestration'', p. 5.</ref> as on the piano]]

Pitch can be adjusted by varying the [[length]] of the string.<ref name=":0">{{Cite web|title = Oxford Music Online by subscription|url = http://www.oxfordmusiconline.com/|website = www.oxfordmusiconline.com|access-date = 2015-09-17|url-status = live|archive-url = http://archive.wikiwix.com/cache/20110224031012/http://www.oxfordmusiconline.com|archive-date = 2011-02-24}}</ref>{{Better source needed|date=June 2023|reason=That's just the home page of Oxford Music Online.}} A longer string results in a lower pitch, while a shorter string results in a higher pitch. A [[concert harp]] has pedals that cause a hard object to make contact with a string to shorten its vibrating length during a performance.<ref name="woosterped">{{cite web |last1=Wooster |first1=Patricia McNulty |title=Pedal Harp 101 |url=https://www.harpspectrum.org/pedal/wooster.shtml |website=harp spectrum.org |access-date=March 18, 2021}}</ref> The frequency is inversely proportional to the length:

:<math>
f \propto \frac{1}{l}
</math>

A string twice as long produces a tone of half the frequency (one octave lower).