In stringed instruments, the sound source is a tensioned, vibrating string. The length, thickness, tension and density of the string all affect the pitch of a given string. Longer, thicker, and looser strings vibrate slower than shorter, thinner, tighter strings. After tuning a stringed instrument, the player can fret (press down) on the strings at certain points to shorten the vibrating portion of the string, thereby changing the tone that is produced.
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