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There is a certain relationship with the glass harmonica and the clavic cylinder. The glass harmonica produces the sound by friction from touching the rotating bells with wet fingers. With the terpodion, operating the keyboard pushes a wooden or metal arm against a rotating coated cylinder of wood or other material, producing sounds by friction.
Rhythm is indicated in a rudimentary way only, with long and short symbols. The Seikilos epitaph has been variously dated between the 2nd century BCE to the 2nd century CE. Three hymns by Mesomedes of Crete exist in manuscript. The Delphic Hymns, dated to the 2nd century BCE also use this notation, but they are not completely preserved.
In brass instruments, the most common method of producing multiphonics is by simultaneously playing the instrument and singing into it. When the sung note has a different frequency than the played note (preferably within the harmonic series of the played note), several new notes that are the sums/differences of the frequencies of the sung note and the played note are produced; leading to the ...
The frequency of the sound waves producing a pitch can be measured precisely, but the perception of pitch is more complex because single notes from natural sources are usually a complex mix of many frequencies. Accordingly, theorists often describe pitch as a subjective sensation rather than an objective measurement of sound. [28]
Singers can also learn to project sound in certain ways so that it resonates better within their vocal tract. This is known as vocal resonation. Another major influence on vocal sound and production is the function of the larynx, which people can manipulate in different ways to produce different sounds.
According to the source–filter theory, the resulting sound excites the resonance chamber that is the vocal tract to produce the individual speech sounds. The vocal folds will not oscillate if they are not sufficiently close to one another, are not under sufficient tension or under too much tension, or if the pressure drop across the larynx is ...