What is the primary sound produced by a bull-roarer?

The primary sound produced by a bull-roarer is a pulsing, low-pitched roar. This unique instrument, which consists of a flat piece of wood attached to a string, generates sound through rapid spinning. As the player swings it in a circular motion, the air is disturbed, causing the wooden blade to vibrate, which results in that characteristic deep, resonant sound.

Bull-roarers have been used in various cultural rituals and ceremonies, often signifying important messages or serving as a means of communication over long distances. The low-pitched qualities are especially significant because they carry well, making the sound suitable for outdoor use.

The other options describe sounds that do not align with the authentic acoustic characteristics of a bull-roarer. Humming melodies, sharp high-pitched sounds, and soft whispering sounds do not capture the essence of the instrument's primary auditory output. This starkly differentiates the bull-roarer from other musical instruments, emphasizing its unique role in traditional music practices.