Luke Bryan, Thomas Rhett and more of the biggest names in country music hit the stage at Nissan Stadium on Sunday night (June 10) to close out the 2018 CMA Music Festival with special performances that were dotted with surprise guests.

Florida Georgia Line joined Bebe Rexha and the Backstreet Boys to perform "Meant to Be" and "God, Your Mama and Me," both of which reached No. 1. Dierks Bentley gave fans special live collaborations with Dwight Yoakam and Brothers Osborne, the latter of whom are on the road with him in 2018 on his headlining Mountain High Tour.

See the Highlights From Day 2 of the 2018 CMA Music Festival

The 2018 CMA Music Festival was filled with special moments from all kinds of performers, including Yodeling Walmart Boy Mason Ramsey, who proved he's a lot more than just a novelty act with an impressive rendition of the national anthem. Garth Brooks teased an upcoming new single and a massive tour he's about to announce, and Sam Hunt surprised fans when he dropped by Nissan Stadium to perform his latest single, "Downtown's Dead."

Those were just a few of the highlights of the four-day festival, which brings tens of thousands of fans from all over the world to Nashville every year for concerts, Q&A sessions, fan club parties, autograph signings and more. It's a chance for fans to get up close and personal with their favorite country singers, and that's what makes CMA Music Festival the biggest event in country music each year.

See the Highlights From Day 3 of the 2018 CMA Music Festival