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A number of instruments have been invented, designed, and made, that make sound from matter in its liquid state. This class of instruments is called hydraulophones . Hydraulophones use an incompressible fluid, such as water, as the initial sound-producing medium, and they may also use the hydraulic fluid as a user-interface.
The use of found objects in music takes one of two general forms: either objects are deliberately recorded, with their sound used directly or in processed form, or previous recordings are sampled for use as part of a work (the latter often being referred to simply as "found sound" or "sampling").
The criteria for classifying musical instruments vary depending on the point of view, time, and place. The many various approaches examine aspects such as the physical properties of the instrument (shape, construction, material composition, physical state, etc.), the manner in which the instrument is played (plucked, bowed, etc.), the means by which the instrument produces sound, the quality ...
This process involves several audio analysis tasks, which may include multi-pitch detection, onset detection, duration estimation, instrument identification, and the extraction of harmonic, rhythmic or melodic information. This task becomes more difficult with greater numbers of instruments and a greater polyphony level.
Struck idiophones is one of the categories of idiophones (that is, any musical instrument that creates sound primarily by the instrument as a whole vibrating—without the use of strings or membranes) that are found in the Hornbostel-Sachs system of musical instrument classification. Struck idiophones are categorised as 11 in the Hornbostel ...
' sound of wood ') is a musical instrument in the percussion family that consists of wooden bars struck by mallets. Each bar is an idiophone tuned to a pitch of a musical scale, whether pentatonic or heptatonic in the case of many African and Asian instruments, diatonic in many western children's instruments, or chromatic for orchestral use.
It searches an index of over 1,000,000 sounds on the internet, with 100,000 users and 1,000,000 searches each month. The index mainly consists of sound effects and musical instrument samples. Results are in AIFF, AU and WAV formats, in both mono and stereo. The site offers the FindSounds Palette, a program which also searches the FindSounds index.
The instrument name comes from the category plasmaphones, in which the sound comes from plasma. unpitched percussion: Pyrophone: plasmaphone: Uses explosions to produce sound in pipes. Weak similarity to pipe organ or calliope (which run air/steam through pipes, but producing sound through the friction of air on ducts). pitched percussion ...