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The triangle is a musical instrument in the percussion family, and is classified as an idiophone in the Hornbostel-Sachs classification system. Triangles are made from a variety of metals including aluminum, beryllium copper, brass, bronze, iron, and steel. The metal is formed into a triangle shape by bending or casting methods. The instrument is usually held by a loop of some form of thread or wire at the top curve. The triangle theoretically has indefinite pitch, and produces a plurality of overtones when struck with an appropriate beater.

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A cymbal is a common percussion instrument. Often used in pairs, cymbals consist of thin, normally round plates of various alloys. The majority of cymbals are of indefinite pitch, although small disc-shaped cymbals based on ancient designs sound a definite note (such as crotales). Cymbals are used in many ensembles ranging from the orchestra, percussion ensembles, jazz bands, heavy metal bands, and marching groups. Drum kits usually incorporate at least a crash, ride, or crash/ride, and a pair of hi-hat cymbals. A player of cymbals is known as a cymbalist.

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The bass guitar, electric bass or simply bass, is the lowest-pitched member of the string family. It is a plucked string instrument similar in appearance and construction to an electric or an acoustic guitar, but with a longer neck and scale length, and typically four to six strings or courses. Since the mid-1950s, the bass guitar has largely replaced the double bass in popular music.

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The harp is different from the other stringed instruments. It's tall, about six feet, shaped a little like the number 7, and has 47 strings of varying lengths, which are tuned to the notes of the white keys of the piano. There are usually one or two harps in an orchestra and they play both melody and harmony. You play the harp sitting down with your legs on either side, with the neck of the harp leaning on your right shoulder. Each string sounds a different note (they come in different colors to help you tell one from another) and you play them by plucking the strings with your fingertips and thumb. Attached to the bottom of the harp are seven foot pedals, which change the pitch of each string and allow them to sound the pitches of the black keys on the piano.

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The piano is a stringed keyboard instrument in which the strings are struck by wooden hammers that are coated with a softer material (modern hammers are covered with dense wool felt; some early pianos used leather). It is played using a keyboard, which is a row of keys (small levers) that the performer presses down or strikes with the fingers and thumbs of both hands to cause the hammers to strike the strings. It was invented in Italy by Bartolomeo Cristofori around the year 1700.

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This is the grandfather of the string family. At over 6 feet long, the double bass is the biggest member of the string family, with the longest strings, which allow it to play very low notes. The 6 to 8 double basses of the orchestra are almost always playing the harmony. They are so big that you have to stand up or sit on a very tall stool to play them, and it helps if you have long arms and big hands. Like the cello, the body of the double bass stands on the ground, supported by a metal peg, and the neck rests on your left shoulder. You produce sound just like on a cello, using the left hand to change pitch and the right to move the bow or pluck the string.

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The saxophone (referred to colloquially as the sax) is a type of single-reed woodwind instrument with a conical body, usually made of brass. As with all single-reed instruments, sound is produced when a reed on a mouthpiece vibrates to produce a sound wave inside the instrument's body. The pitch is controlled by opening and closing holes in the body to change the effective length of the tube.

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Maracas come from Mexico. They are rattles, often made from gourds (a kind of squash), filled with dried seeds, beads or even tiny ball bearings that make them rattle. Maracas can also be made of wood or plastic; the sound they make depends on what they're made of. To play them, you hold them in your hands and shake.

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Timpani look like big polished bowls or upside-down teakettles, which is why they're also called kettledrums. They are big copper pots with drumheads made of calfskin or plastic stretched over their tops. Timpani are tuned instruments, which means they can play different notes. The timpanist changes the pitch by stretching or loosening the drumheads, which are attached to a foot pedal. Timpani are a central part of the percussion family because they support rhythm, melody and harmony. Most orchestras have four timpani of different sizes and tuned to different pitches and they are usually played by one musician, who hits the drumheads with felt-tipped mallets or wooden sticks. The timpani player must have a very good ear because he/she usually needs to change the pitches of the drums during performances.

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The violin, sometimes known as a fiddle, is a wooden chordophone (string instrument) in the violin family. Most violins have a hollow wooden body. It is the smallest and thus highest-pitched instrument (soprano) in the family in regular use. The violin typically has four strings (some can have five), usually tuned in perfect fifths with notes G3, D4, A4, E5, and is most commonly played by drawing a bow across its strings. It can also be played by plucking the strings with the fingers (pizzicato) and, in specialized cases, by striking the strings with the wooden side of the bow (col legno).

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The guitar is a fretted musical instrument that typically has six strings. It is usually held flat against the player's body and played by strumming or plucking the strings with the dominant hand, while simultaneously pressing selected strings against frets with the fingers of the opposite hand. A plectrum or individual finger picks may also be used to strike the strings. The sound of the guitar is projected either acoustically, by means of a resonant chamber on the instrument, or amplified by an electronic pickup and an amplifier.