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SOVTEs: All The Cool Kids Are Doing Them!

Updated: May 4, 2022

You've likely heard and even used straw phonation in your voice studio, but why have straws become an essential tool in voice studio? Let's take a bit of time to review the science and the voice-y goodness behind a special class of vocal exercises known as SOVTEs.

SOVTEs are semi-occluded vocal tract exercises. Semi-occluded simply means to partially close off the vocal tract in some way, which means that just about anything you do to partially close the vocal tract can be turned into an SOVTE. That makes this designation incredibly fluid and versatile, and gives you virtually limitless options to find some kind of SOVTE that can benefit your clients. Because not all clients respond positively or in the same way to every exercise, having the flexibility to explore and find something that works is a really big benefit to this type of vocal exercise.

There's been a ton of research already done on why these exercises work, and what exactly is going on at the vocal fold level. While questions still remain, we have a pretty good handle on a lot of the physics and physiology behind them. (By the way, if you want to get a really great overview of the science, I highly recommend this article in Journal of Singing by Kelley Hijleh and Cory Pinto (you might have to log in to NATS to read it, but if you aren't a member, send me a message and I can hook you up!). Trust me, this one is fantastic and worth the time to go through carefully.) At its core, the principle behind SOVTEs is using impedance to encourage efficient vocal fold vibration. Let's break that down a bit.

The fancy physics definition of impedance is "a combination of reactance and resistance." What this means practically is "how much opposition a system encounters as it starts up" (Hijleh and Pinto). It's a ratio with two parts: resistance and reactance. Having more of one part and less of the other can affect how easily the system starts up. For voices, we want the start up to be as easy as possible while still being efficient. SOVTEs can help manipulate that balance.

The two parts to impedance are:

  1. Resistance, which is the dissipation of energy, and

  2. Reactance, which stores up energy.

Reactance also has two parts:

  1. Compliance, which is a barrier to the voice starting up (I find this a bit confusing, to be honest, since one would think compliance would encourage the voice working, but I think my colloquial understanding of the word clouds this up a bit for me), and

  2. Inertance, which takes the stored energy of reactance and puts it into phonation.

Now, here's where things can get a bit tricky for us as voice teachers. Not all SOVTEs work in exactly the same way. Some SOVTEs partially close the vocal tract through the whole exercise (like humming or straws, for example), some fluctuate in how the vocal tract is partially closed (like lip trills), and still more can have varying rates of closure. The type of closure can change the ratio of impedance and can target different areas of the vocal tract. Coupled with the unique needs of the client right in front of you, some SOVTEs may work fantastically well for that client, and others might not. It takes a bit of experimentation sometimes to find the thing that is going to work best.

And of course, straws may work well for your client today, but next week will be different and need a different strategy. It's helpful to have a tool box with several different kinds of SOVTEs to try in order to find what works for your client on any particular day.

In no particular order, here are some common SOVTEs that you can use:

  • singing through straws

  • singing through straws with the end in a bit of water

  • humming

  • "ng" sounds

  • kazoo

  • pursed lip singing, which is basically an "ooh" with an exaggerated lip extension

  • singing with your hand over your mouth

  • singing into a cup or a mask (anesthesia or oxygen masks work well)

  • tongue trills

Would you have any other exercises to add? There are countless variations on any of the above exercises, too, so you can find all kinds of ways to address the needs of your clients. If you have more ideas, I'd love to hear them! Comment below or send me a message to let me know what you have found effective in your studio.

I'll have more info on SOVTEs next month, and I'm looking into doing a workshop later this year diving into more of the physics and the science behind SOVTEs. If you'd be interested in that, please let me know! To keep up to date on that, sign up for my email list to get the info sent straight to you about that workshop and other events that I have coming up. Click on the button below to get on the list. Happy singing!


Hijleh, K. and Pinto, C. (2021). "Realizing the Benefits of SOVTEs: A Reflection on the Research." Journal of Singing, 77(3), 333-344.

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4 commentaires

Teresa Tam
Teresa Tam
16 août 2022

Thanks for the blog. Is it possible to get access to the article of Journal of Singing by Kelley Hijleh and Cory Pinto you linked to? Thank you!

Dr. Heather Nelson
Dr. Heather Nelson
14 mars 2023
En réponse à

Teresa, I'm not sure if I responded to this or not, and if I didn't, I'm very sorry I missed it! I'll try to get a copy sent to you today.


Kalliope Coplin
Kalliope Coplin
29 avr. 2022

Great article. would be interested in the workshop 😊. Also cannot click the link to the journal article. thanks

En réponse à

Great! I'll start planning a workshop to come later. If you haven't yet signed up for my email list, that's a great place to get info on upcoming things. Here's the link to sign up:

And thanks for letting me know about the dead link. I'm working on it right now, and it should be fixed in a few minutes.

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