Cranky old people might think that mellow crooning is less damaging to the voice than beatboxing, with its harsh, high-energy percussive sounds.
Not so, according to a paper in the Journal of Voice. Beatboxing may be harder on the ears, that is why Michael Bublé gets more downloads than Killa Kela, but it may actually be gentler on vocal cords, which are already injury-prone. His findings were published Dec. 23 online in the Journal of Voice.
If you are not familiar with Beatboxing, it is a type of vocal percussion in which performers imitate drum sounds with the voice. See video below.
"While there are lots of data on how the voice is used and can be injured in singers, little is known about the structures involved in beatboxing and if it poses a risk of injury to the vocal tract," said Dr. H. Steven Sims of the University of Illinois.
Sims imaged the vocal tracts of four male beatbox artists using a flexible fiber optic endoscope threaded through the nose and positioned just above the vocal apparatus. Another camera recorded the artists as they performed various isolated and combination beatbox sounds. Side by side, the videos show which vocal structures are engaged as the artists riff.
Sims found that beatboxers use the whole vocal tract to produce a range of sounds, spreading the energy among several structures and minimizing wear on any single part. They also tended to keep the glottis – the space between the vocal cords – open.
"Keeping the glottis open means that beatboxing may actually be protective of the vocal folds," Sims said.
The beatboxers also employed the pharyngeal muscles to elongate the vocal tract to produce higher pitch sounds, Sims said, which takes some stress off the vocal cords.
"Singers rely almost exclusively on the vocal cords themselves to produce their sounds," Sims said. "So all the energy involved with singing is concentrated on these structures, which can develop scar tissue with overuse."
Sims says that some of the techniques beatboxers use could help singers relieve stress on their vocal cords. For instance, using muscles to elongate the vocal tract, he said, could help singers "get themselves a little closer to that high note, before engaging the vocal folds."
The technique could be useful for Broadway singers who have up to eight shows a week and need to compete in sound volume with an orchestra.
Sims hopes to follow up this research by studying female beatboxers.
"Women use their voices differently, in part because their larynxes are smaller and are shaped differently than men's. So the results could be very interesting."