How well do you know the 2019 iHeartRadio Music Festival performers?

Alicia Keys has been huge since her first album dropped way back in 2001. Her single "Falllin'" off that album sold 16 million copies! Since then, she's gone on to win 15 Grammy Awards.

Monsta X is a K-pop boy band that's only been around since 2015. They were formed on a reality show called "No.Mercy," which is as legit a way as any to get into a band. In 2019, they signed with Epic Records for all their English-language recordings.

Maren Morris's single "My Church" put the singer on the map back in 2016. Aside from being an accomplished solo performer, Morris is also in an all-girl country group called the Highwomen with Brandi Carlile, Natalie Hembry and Amanda Shires.

Cage the Elephant has been around longer than a lot of people realize — they formed as a band back in 2006. At the time, the lead singer was only 16 years old, so when the band moved from Kentucky to England, his parents had to sign parental rights to the rest of the band.

Miley Cyrus spent five years of her life playing the role of "Hannah Montana," which made her a teen idol but also pigeon-holed her as a wholesome pop-country star. She managed to rebel against that image as a young adult and branch out to become a much more diverse musician.

Chance the Rapper won a Grammy for his mixtape "Coloring Book" and also for Best Rap Performance in 2017 and Best New Rapper the same year, all of which came before he actually released a studio album. Said studio album didn't happen until 2019.

Camila Cabello got her start thanks to 2012's season of "The X Factor" which formed the girl group "Fifth Harmony." She's also set to star as Cinderella in a non-Disney adaptation of the story.

Gabriella Wilson started going by H.E.R back in 2016. The acronym stands for "Having Everything Revealed." She got her start covering an Alicia Keys song on "The Today Show" when she was still a kid.

Billie Eilish's full name is Billie Eilish Pirate Baird O'Connell, which is pretty intense and wouldn't fit well on a poster, so you can see why she shortened it. At only 17, she already has seven gold and three platinum singles.

Def Leppard is one of the biggest acts in music history and has managed to sell more than 100 million albums over the course of their career. While many bands have albums go gold or platinum, Def Leppard has not one but two diamond albums that sold over 10 million copies each.

The Backstreet Boys are back, and why not? They've sold over 100 million albums worldwide, and their first 10 albums all went right to the Top 20 on the Billboard 200. They were the first band since Led Zepplin in the '70s to do that.

After getting some notoriety for his homemade covers posted online back in 2014, Brown managed to run a successful Kickstarter that allowed him to produce a six-song EP. That album charted on the Top Country Album charts and then kickstarted his career.

Brett Young was pursuing an interest in baseball and had even gotten a scholarship to the University of Mississippi after turning down a pre-draft selection from both the Minnesota Twins and the Tampa Bay Devil Rays. An elbow injury caused him to focus his efforts on music.

Although Alicia Keys has been acting for some years and even appeared in a 1985 episode of "The Cosby Show," it wasn't until 2007's "Smokin' Aces" that she was actually in a feature film.

Mumford and Sons spent their first few years doing very small gigs in the U.K. and then in the U.S. drumming up a fanbase. Their debut single "Little Lion Man" rocketed the band to fame and won them a Grammy nomination.

French Montana is known for his eclectic tastes in pets, which once included two tiger cubs. He eventually re-homed the cubs when he realized taking care of them was going to be something better suited to someone with more time and resources to do so.

Steve Aoki's father was known professionally as the wrestler Rocky Aoki, but odds are his even greater legacy is the fact that he founded the Benihana restaurant chain. His father briefly dabbled in music but said he changed to wrestling became he sucked at staying on tempo.

Darren Criss played Blaine Anderson on the show "Glee" and more recently took the lead role in "The Assassination of Gianna Versace: American Crime Story," a role for which he received both an Emmy and a Golden Globe.

Halsey's real name is Ashley Nicolette Frangipane. Her very first studio album debuted at #2 on the Billboard charts and went platinum. The third single off the album, "Colors," went double platinum.

Heart has managed to produce a top 10 Billboard album in the 1970s, the 1980s, the 1990s and then again in the 2010s, which is a pretty impressive legacy for any band. That gives them the longest span of top-10 albums by a female-led band ever.

Hootie and the Blowfish's debut album "Cracked Rearview" was the top-selling album of 1995 and made the band a household name. To further cement their fame, one of the biggest hits the band produced was only released on the soundtrack to the mega-popular TV show "Friends."

Tim McGraw is hands down one of the biggest names in country music in the world, if not the biggest. He's sold more than 80 million records and headlined one of the highest-grossing country music tours of all time back in 2006.

"Chicken Fried" was actually recorded a couple of times before the band re-recorded it for the debut studio album. It was their first number-one hit on the Billboard country music charts and even made it into a Larry the Cable Guy movie.

Marshmello took to wearing a large marshmallow helmet as a bit of an homage to fellow DJ Deadmau5. For a couple of years, Marshmello's identity was totally unknown until other performers started referring to him by his real name — Chris Comstock — in interviews.

Old Dominion was formed in Nashville even though most of the band actually came from Virginia. Their name is a direct reference to that, since "Old Dominion" is the nickname of the state of Virginia.

Fletcher's full name is Cari Elise Fletcher, and even though she made her late-night TV debut on "the Tonight Show," it wasn't her first foray in front of the camera. She'd previously been on "The X Factor" and also starred in the movie "How Katie Howard Found Herself."

CNCO toured as an opening act for Ricky Martin back in 2016. Martin had been the producer of the show on which the band was formed, and when they won the competition, he began to represent them professionally.

Andrew Fedyk and Joe Depace make up the duo of Loud Luxury. Though they call L.A. home these days, the pair met in school back in Canada and began collaborating after being inspired by Porter Robinson.

Zara Larsson was only 10 when she won the show "Talang" back in 2008. Four years later, she signed her first recording contract. By 2017, her singles were charting throughout Europe and in the U.S. as well.

Bryce Vine's single "Drew Barrymore" does not actually feature Drew Barrymore and isn't even really about Drew Barrymore. Vine has said she's the kind of woman he was inspired by, though: someone both sweet and sexy and who seems really cool.

Chicago rapper Juice WRLD has some clearly diverse taste in music and has listed all kinds of singers as being an inspiration to him. Aside from rap or hip-hop, his music has also been labeled emo and rock as well.

McGraw married fellow country star Faith Hill back in 1996. The two of them together headlined the SoulISoul tour back in 2005 and then followed it up a year later with SoulIISoul II and then Soul2Soul 2007.

Lauv, whose real name is Ari Noah Staprans Leff, has written songs for acts like Charlie XCX as well as Demi Lovato and Cheat Codes, Khalid, Backstreet Boys and numerous others. He finally put out his own studio album in 2019.

Chance the Rapper didn't just write a Kit Kat jingle: He starred in a Kit Kat commercial as well. In the commercial, Chance the Rapper discovers a Kit Kat featuring Chance the Wrapper. That's just good writing.

No other female artist has managed the unusual feat of charting as three different people, except for Miley Cyrus. Obviously, she's charted as herself, but she also managed to chart under her famous TV persona of Hannah Montana and, more recently, as her "Black Mirror" character Ashley O.