Happy Birthday, Sia: Her 10 Most Dynamic Vocal Moments

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Sia performs "Unforgettable" on The Ellen DeGeneres Show.

When you think Sia, it's hard not to think of her insane voice.

With the Australian singer's two most recent albums, this year's This Is Acting and 2015's 1000 Forms of Fear, focusing more on her powerhouse range than any of her previous albums, just about every song and performance could be considered dynamic. But in celebration of Sia's 41st birthday Sunday (Dec. 18), we couldn't help rounding up some of our favorites.

"Chandelier" on Ellen, May 2014 

No matter where Sia performs this tune, it's bound to be impressive. Considering it's probably one of the more difficult tracks to remain vocally consistent while singing (do you hear that note at the end of the word "chandelier"?), the fact that she nailed practically every note deserves a standing ovation.

"Alive" on The Voice, December 2015

Another challenging track, Sia's effortless delivery of the This Is Acting song -- in front of Pharrell, Gwen Stefani, Blake Shelton and Adam Levine, no less -- makes it quite the jaw-dropper.

"Diamonds" on Carpool Karaoke, February 2016 

It's no secret that Sia was the one who penned Rihanna's No. 1 hit, but it's not every day that we get to hear her do the singing. So when she got the chance in the car with James Corden, she held absolutely nothing back.

"Titanium" on Carpool Karaoke

Sia gave her all in her car ride with Corden, so much so that we had to honor two moments from the 11-minute segment. That power note when she sings "I am titanium" is chilling, especially in close quarters. 

"Elastic Heart" on Saturday Night Live, January 2015

Sia has made most of her performances in recent years more about the artfulness of the visual performance than her vocals, but even despite the dancers, it's hard not to focus on how captivating her voice is in "Elastic Heart" when she belts out those notes.

"Breathe Me" at SXSW in March 2007

As any serious Sia fan would know, "Breathe Me" is not one of the singer's most lively song of her career. But the soft vocals of this heartbreaking tune helped Sia bring this song to life while staying true to the emotion of it.

While we've seen plenty of mind-blowing renditions of Sia's biggest hits, some of her songs don't get to see the stage as often as the ones that are popular. Indulge in some of the best album moments below.

"Bird Set Free," This Is Acting

One of the many impressive This Is Acting numbers, the true standout for this song comes primarily in the pre- and post- chorus parts.

"Space Between," This Is Acting

Oh, the irony about the fact that she's singing about something being "deafening" when she delivers the line with such vigor.

"Soon We’ll Be Found," Some People Have REAL Problems

Because many of Sia's older songs don't have the same bravado as her newer material, "Soon We'll Be Found" may not sound as particularly dynamic as others on this list. But the haunting tempo of this song's chorus earns it a "dynamic" label amidst the quieter tracks.

"Fire Meet Gasoline," 1000 Forms of Fear

Who would've ever thought that singing the phrase "I'm burning alive" would be so invigorating?