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The nabal is a long, straight brass horn used in Korean traditional music. As the instrument has no valves or finger holes it is not a melodic instrument but rather plays a single sustained tone. The precise frequency of the tone produced can be quite different depending on the size of the individual instrument. The total length is not constant, ranging from 103 cm to 122 cm. Also, the shape of the instrument is slightly different.
- "나발 - 문화콘텐츠닷컴". www.culturecontent.com. Retrieved 2021-05-10.