
Overblowing is a technique used while playing a wind instrument which, primarily through manipulation of the supplied air (versus, e.g., a fingering change or operation of a slide), causes the sounded pitch to jump to a higher one. Depending on the instrument (and less so on the player), overblowing may involve a change in air pressure, in the poi...
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http://en.wikipedia.org/wiki/Overblowing

(from the article `wind instrument`) ...are short in relation to their diameter, they are generally capable of sounding the fundamental and respond best to pitches low in the harmonic ...
Found on
http://www.britannica.com/eb/a-z/o/41
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