The gayageum body is carved from paulownia wood, which is lightweight but resonant ā meaning it sends the sound singing out clearly. Each of the 12 strings rests on its own moveable bridge, which the player adjusts to tune the instrument before playing. The sound is warm, delicate and slightly twangy.
A skilled gayageum player can produce beautiful vibrato ā a gentle wavering in the pitch ā by rocking a finger on the string after plucking it. They can also slide between notes, which gives Korean traditional music its characteristic flowing, expressive sound.
The gayageum appears in two main sizes. The 'jeong-ak' version is larger and plays slow, stately court music. The 'sanjo' version is slightly smaller and used for lively, improvisational folk music that builds in speed and excitement as the piece goes on.
Today the gayageum is taught in music schools across the Korean peninsula and is played in orchestras, small ensembles and solo performances. Modern composers write new music for it, blending its traditional sound with jazz, pop and contemporary styles.