Who's Performing At IHeartRadio Country Festival This Year? Here Are The 5 Best Moments From The Show.

How many country stars can they fit in one room?

As every big time country music fan surely knows, May 27 is an important date this year. No, it's not the release date for a new Little Big Town album or Johnny Cash's birthday. It's the day the largest annual country music show is airing on television. Who's performing at the 2015 IHeartMusic Country Festival? This lineup is insane: Darius Rucker, Little Big Town, Dierks Bentley, Justin Moore, The Band Perry, Tim McGraw, Rascal Flatts, Brad Paisley, Brantley Gilbert, Sam Hunt, Tyler Farr and more. Clearly, the gods of country music have blessed us all with the best list of performers they could possibly think of, all together for one epic show.

The concert actually took place earlier this month, but it's only just now airing on TV. Because it's not live, we already know about several of the show's biggest moments, like an unexpected cover of "Uptown Funk" by The Band Perry, and Justin Moore's touching rendition of "If Heaven Wasn't So Far Away." But the music is only half the fun. The interactions between all these fabulous performers, as well as hosts Darius Rucker and Jennifer Nettles, is great entertainment all on its own.

1. "Small Town Throwdown," featuring a guest.

Cowboy hat vs. baseball cap. Who will emerge victorious?

2. The audience sang "Happy Birthday" to Tim McGraw.

Probably the best birthday party ever.

3. Darius Rucker crowd surfed.

Just make sure he gets back to the stage!

4. The Band Perry gets funky.

This song defies all genre borders.

5. And Justin Moore brought it home.

So moving.

If you're excited for the IHeartRadio Country Festival, airing on Wednesday, May 27 at 9 p.m. ET on NBC, share this post!