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Why can a bugle play only a limited number of notes?
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wind instrument
The Japanese end-blown flute, or shakuhachi.
A bugle can play only a limited number of notes because it lacks mechanisms, such as valves or slides, to alter the length of its tubing.12
In brass instruments, the pitch is determined by the length of the air column. Because the bugle consists of a fixed length of tubing, it is restricted to producing only the notes found within its natural harmonic series—specifically the second to sixth notes of that series. While modern brass instruments use valves or slides to change the tube length and access a full chromatic scale, the traditional bugle relies solely on the player's lip vibration to select from these naturally occurring harmonics.21