20 Songs You Didn't Know Came From Sia

Emotion is one of the most underrated pop albums of 2015, so it's safe to say nearly every song off it is gold. "Boy Problems," of course, is no exception.

Britney Spears cowrote this song with Sia. It's reported that the song has real-life ties to Jason Trawick, whom Britney split from during the recording process.

Sia offered this song to both Katy Perry and Rihanna before she ultimately gave it to Beyoncé.

This song topped music charts in over 20 countries and became Rihanna's 12th No. 1 single.

The song comes from Kylie Minogue's 12th studio album, which shares the same name.

Even though this one only made it onto the deluxe edition of Shakira's self-titled album, it still bangs.

Clarkson's new album, Piece By Piece, contains this song from Sia, and comes out next month!

This song, from Maroon 5's latest album V, features stunning vocals from Gwen Stefani and Adam Levine. Keeping our fingers crossed for a music video.

This song received favorable reviews from critics, including a Billboard critic who claimed the song re-established NeYo's top 40 appeal.

This song became Celine Dion's 40th entry onto the Billboard Music charts.

This song, featuring Sia's voice, is Flo Rida's bestselling single to date and one of the bestselling singles of all time.

Sia cowrote this No. 1 single, making it the first time Sia's name hit the top spot. It's also, notably, the song Anna Kendrick sings in the shower in Pitch Perfect.

After the epic success and acclaim surrounding "Titanium," Sia and David Guetta paired up again.

This is almost surely Sia's most popular and well-known song to date and was featured in the intensely emotional series finale of Six Feet Under.

Lea Michele sat down with Sia to conceptualize this song, which was about the loss of Cory Monteith.

This is arguably Rita Ora's most popular song, and it has Sia's name on it!

"You Lost Me" was one of many songs Sia contributed to Christina's Bionic album. Aguilera even called it the heart of the album.