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Now a days, after invention of new instruments, music has changed a lot.Melody of music has increased because of these instruments.Instruments are often divided by the way in which they generate sound:Voice, that is, the human voice, is an instrument in its own right. A singer generates sounds when airflow from the lungs sets the vocal cords into oscillation. The fundamental frequency is controlled by the tension of the vocal cords and the tone quality by the formation of the vocal tract; a wide range of sounds can be created.A steel string acoustic guitarString instruments generate a sound when the string is plucked, strummed, slapped, etc. The frequency of the wave generated (and therefore the note produced) usually depends on the length of the vibrating portion of the string, its linear density (mass per unit length of string), the tension of each string and the point at which the string is excited; the tone quality varies with the construction of the resonating cavity. Examples: guitars, violins and sitars. Electric string instruments generate sound by a pickup placed under strings. The electric guitar and the electric bass are the most famous examples, but there is a wide variety of new instruments, because the electro-magnetic amplification generates new possibilities. Other Examples: 3rd bridge overtone koto, electric baritone, electric cymbalom.Wind instruments generate a sound when a column of air is made to vibrate inside them. The frequency of the wave generated is related to the length of the column of air and the shape of the instrument, while the tone quality of the sound generated is affected by the construction of the instrument and method of tone production. The group is typically subdivided into :Woodwind instruments, such as the clarinet, saxophone and flute,Brass instruments, such as the trumpet, trombone and French horn.Percussion instruments create sound when struck. The shape and material of the part of the instrument to be struck and the shape of the resonating cavity, if any, determine the sound of the instrument. Examples: drums, bells and cymbals.Lamellophones create a sound by the plucking of lamellas made from different materials (metal, raphia etc.). These Instruments are tunable, so they do not belong to the idiophones. An example is the Mbira.Electronic instruments generate sound through electronic means. They often mimic other instruments in their design, particularly keyboards, drums and guitars. Examples: synthesizers and theremins.Keyboard instruments are any instruments that are played with a musical keyboard. Every key generates one or more sounds; most keyboard instruments have extra means (pedals for a piano, stops for an organ) to manipulate these sounds. They may produce sound by wind being fanned (organ) or pumped (accordion), vibrating strings either hammered (piano) or plucked (harpsichord), by electronic means (synthesizer) or in some other way. Sometimes, instruments that do not usually have a keyboard, such as the Glockenspiel, are fitted with one. Though they have no moving parts and are struck by mallets held in the player's hands, they possess the same physical arrangement of keys and produce soundwaves in a similar manner.Friction instruments are any instrument that use friction to create sound. For example the Glass harmonica or the turntable.Many alternate divisions and further subdivisions of instruments exist. To learn about specific instruments, consult the list of musical instruments or list of archaic musical instruments.