String instruments:
  • Stringed instruments like the guitar have string or wire to produce vibrations, and hence the specific sound is produced.
  • These instruments also have hollow boxes that amplify the sound that is produced.
  • The frequency of a sound wave is varied by varying the length of the vibrating string. Violin, Guitar, Sitar are some of the examples of stringed instruments.
  • A musical string has several frequencies at which it can vibrate naturally. These natural frequencies are known as the harmonics of the string.
  • The natural frequency at which an instrument vibrates depends upon the string's tension, the linear density of the string, and the length of the string.
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Percussion instruments:
  • Percussion instruments produce a specific sound when they are struck, scrapped or clashed together. They are the oldest type of musical instrument.
  • There is a fantastic variety of percussion instruments all over the world.
  • Percussion instruments like the drum and tabla consist of a leather membrane stretched across a hollow box called the resonator. When a membrane is hit, it starts vibrating and produces sound.