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Music History was made once again during this year's iHeartRadio Music Festival. With an impressive line-up, tons of surprise guest appearances and performances, and an energetic Las Vegas atmosphere, the 2-day music super bowl at the MGM Grand Garden Arena was a weekend we'll always remember.

In the words of Barney Stinson ("How I Met Your Mother"), it was "LEGEN - wait for it - DARY!" 

Check out the top 18 moments (in no particular order because everything was EPIC) that we'll never forget, and be sure to watch the television broadcast of the iHeartRadio Music Festival when it airs as an exclusive two-night special on The CW network on September 29th!

1. Macklemore's surprise appearance during Ed Sheeran's set to perform "Same Love."

2. Chris Martin casually taking a selfie with a fan's phone ... while laying down on stage.

3. Nicki Minaj's FLAWLESS a capella performance of her "Flawless" remix verse, after her music cut out. 

And "Anaconda," obviously.

4. Usher and Chris Brown's dance off ... and Usher setting his own shoes ON FIRE after he danced right out of them! Talk about "New Flame" (see what they did there).

5. Alicia Keys' inspiring performance of her new single "We Are Here," as images of fans with their powerful #WeAreHere messages displayed behind her.

6. Pete Wentz white raver rafting during Steve Aoki's set. Steve debuted his Fall Out Boy collaboration "Back To Earth" from his new album Neon Future I.

Also, he caked some very lucky fans on stage. HE LET THEM EAT CAKE. They were raging with happiness and frosting.

7. Zac Brown Band's amazing cover of Queen's "Bohemian Rhapsody."

8. Pretty much Motley Crue's entire performance. Where else can you see male back-up dancers in pasties, jaw-dropping pole dancing, crazy pyro, and a string quartet of stunningly GORGEOUS ladies on one stage with a legendary rock band?


Photo: Brian Friedman for iHeartRadio


Photo: Brian Friedman for iHeartRadio

9. Paramore inviting a pretty talented fan on stage to rock out and sing one of their best songs, "Misery Business."

10. Taylor Swift shaking it off. Because we can never get enough of T-Swift's dance moves. You go, girl.

11. Childish Gambino and Ariana Grande performing their song "Break Your Heart Right Back." BTW, both of their outfits were ON POINT.

12. Usher giving Alicia Keys' baby-on-the-way some love back stage. This is PRECIOUS.

13. Weezer's epic group drum session.

14. Neon Trees' Tyler Glenn crowd surfing at the iHeartRadio Music Festival Village. Also, bonus points to Tyler for those sweet socks!

15. The EAR-PIERCING screams and mobs of Directioners and 5 Seconds of Summer fans. On a scale of 1 to Loud, we're pretty sure dogs half way around the world could hear them.

Also, side note. How AWESOME is Michael's iHeartRadio RED hair?!?!?!

16. Calvin Harris bringing out John Newman to perform "Blame." In case you didn't know, John has some AMAZING dance moves. He is gravity-defying.

Also, Calvin DJ'd in a spaceship, basically.

17. Lorde's hairflips. How can you ever get tired of her royal dance moves?

18. Lil Jon made a surprise appearance on Saturday night to perform "Turn Down For What." And then became besties with Ryan Seacrest.

SEE YOU NEXT YEAR, LAS VEGAS! 

For all the other epic moments, CLICK HERE to check out all the action that went down at this year's festival! 

Check out some more photos from this year's festival below! 

Photos: Getty Images