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Music instruments for affordable prices
Wellcome to this presentation of music instruments of high qulity for affordable prices. At this site you will find some selected instruments presented, and further down there are links to two sites where you can find even mor instruments of any kind. Further down on this page there is also some information about the ways music instruments make sound, and modulate the tune and height of the sound.
Xylophones and metallophones
Flutes and harmonicas of metal and wood
Keyboards and travel pianos
Violines and related string instruments
Drums and other percussion instruments
Tambourines and other shaking action instruments
By going through these banners, you get into a good sources of even more music instruments
To see the instruments in presentation 2, please click here
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How does musical instruments make sound and modulate the tune of the sound
Sound is periodic increase and decrease of the presure in a medium that propagate through the medium with a certain speed, the speed of sound in that medium. The medium can be a solid substance, a fluid or a gas, for example air. If you is positioned at a certain place in that medium and measure the pressure, you will observe that it increases or decreases with a certain frequency. If you measure where the pressure is highest or lowest along a path in that medium, you will find that those points occur at a specific distance from each other. You will also find that the higest or lowest pressure intervals are travelling at the speed of the sound, or that they are passing by with the speed of sound.
A phenomenon that is increasing and decreasing periodically and travelling thaT WAY IS called a wave, and since the pressure variates in a sound, a sound is called a pressure wave. When sound is travelling through the air and reaching the ear, it will be heard as a tune and height. The tune depends upon the sound frequency, while the height depens upon how strongly the pressure increases and decreases.
To make a sound, something must vibrate with a certain frequency, and the vibrating object must be in contact with a medium so that the virbration can cause periodic increase and decrease of pressure in that medium. When the vibration causes sound in another medium, energy is transfered, and the vibration will decrease, if the vibration is not sustain with som kind of work subjected upon the vibrating object.
In a music instrument you will have such a virbrating object and you have some way or some mechanism that works mechanically upon that vibrating object. The vibration can then make a sound in the air around. Often you will also have a greater object filled with air, but with openings out to the air around that the primary vibrating object is connected to. The primary vibrating object also sets the greater object in vibration and sound is made both in the air inside the great object and that surrounding it. Such a greater object is called a resonance box. The resonance box makes it possible to deliver more energy to the primary object that is transfered out as sound.
The frequency of vibration in an object is dependent both on the stiffness of that object and of its size. The stiffer and the smaller the object is, the more frequent will the vibration and the sound be, or lighter, or higher up in the scale, will the tone be heard as. To be able to make tunes of various hight, a music instrument must have one or more of these ways of variating the virbrating objects:
- Several vibrating objects with different size and stiffness.
- Objects where smaller or greater parts of them are used to make sound.
- Objects where the stiffness is modulated with smaller or greater mechanical pull on them.
In a string instrument, strings of various sizes are the promary vibrating object.
In many of them the player set a string in vibration by pullings sidewise with his fingers or by rubbing sidewise at the string with a bow. In these instruments the tune hight can also be modulated by varying the size of the vibrating part of each string. This is usually done by pressing a string down at some surface with a finger at various places on the string. These ibnstruments also have an ounter resonance box that the strings are mounted upon. Guitars and violins are typical exaplmes of this type of instrument. Harps work according to the same principle, and here the strings are suspended in a thick hollow frame that also serve as the resonance box.
In many blow instruments the primary vibrating object is the lips of the player together with a mouthpiece and a tube extending from the mouthpiece. The player makes the vibration by blowing through his lips that are held theight togeather. The tune is modulated by shuting in or out tube sections by means of a mechanism operated by the fingers. The vibration makes sound in the air inside the tube. The tube ends in a wide siphone that is serving the role as resonance box. Typical examples of this kind of instruments are trumpets, tubas and trombones.
In pianos and the like the strings are suspended in a frame inside the resonance box, and the vibrations are made by hammers blowing at the strings, or hooks pulling sidewise at the strings. The hammers are set in motion by the player by means of external tangents that are connected to the hammers with some mechanism.
In other blow instruments the primary vibrating object is a mouthpiece with a narrow slot or with two blades togeather with a tube. The player makes vibrations by blowing through the narrow space in the slot or between the blades. The tune is modulated by opening or closing holes in the tube. The part of the tube from the mouthpiece to the first open hole serve as the vibrating object. The rst of the tube togeather with some widening or siphone serve as a resonance box. Examples of these instruments are flutes, saxophones, fagottes and clarinettes.
The reason why blowing through the narrow slot or lips makes sound, is that the blowing makes turbulence in the air inside the slot. To make turbulence, the player must blow with some intensity. The turbulense is caused because the air that is near to the walls inside the slot will pass slower due to friction, than the air passing mid in the slot. Then whirls are constantly created and stopped inside the slot, which makes vibrations.
In some instruments, like xylophones and metallophones, the primary vibrating objects are bars of various length made of wood or metal. The vibrations are made by hitting the bars with a hammer. The bars are typically mounted at the top of the resonance box, or they are mounted on a frame with resonance tubes extended downards from each bar.