Our 2015 iHeartRadio Music Festival is almost here! The annual two-night festival returns to Las Vegas this weekend, September 18th and 19th, and just in like in years past, it's going to be an amazing show.

This year's festival will showcase its start-studded lineup full of our favorite artists, special guests, and there may just be a surprise or two happening during the weekend. 

The best part of all is that EVERYONE can watch it all go down. Fans can tune in to a live stream all weekend long via Yahoo Live both nights, September 18th & 19th at 7:00 p.m. PT/10:00 p.m. ET. 

[RELATED: Here Are All Of The Ways You Can Experience Our 2015 iHeartRadio Music Festival]

Here are 16 reasons you NEED to tune in to our 2015 iHeartRadio Music Festival: 


1. We're all waiting for Kanye West's new album to drop, but until then you can watch him do his thing on stage. Plus, we always learn something from Yeezus.

Kanye West

2. Treat your ears to the heavenly voice that is Sam Smith

Sam Smith

3. Summer may be over now, but you can still stay cool with Demi Lovato!

Demi Lovato

4. Puff Daddy is BACK!

Puff Daddy

5. Disclosure will be there. And so will Sam Smith. And they have two songs together, so maybe they'll perform both? Please, guys?


Disclosure, Sam Smith

6. Jennifer Lopez has got all the right moves on stage EVERY TIME.


Jennifer Lopez

7. Hozier is here to take us to church.



8. We NEED to see The Killers perform our favorite songs. **Cough cough, "Mr. Brightside," cough cough**

The Killers

9. Want to not feel your face? Then tune in to The Weeknd's performance. 

The Weeknd

10. NICK. JONAS. That is all. 

Nick Jonas

11. Speaking of which ... TREY SONGZ!


Trey Songz

12. Jason Derulo's dance moves are INSANE to watch.

Jason Derulo

13. If you're ready to get your dance on, then you won't want to miss Diplo


14. Or David Guetta for that matter.


David Guetta

15. No shirt, no shoes, no problems ... and Kenny Chesney!

Kenny Chesney

16. Our iHeartRadio Music Festival is known for its amazing surprise guest appearances ... who knows who will show up this year! For instance, Fetty Wap will be there.

Fetty Wap

Photo: Getty Images