The biggest award at the 2015 ACM Awards, Entertainer of the Year, has five top-notch contenders vying for the win.

Garth Brooks is already a six-time winner of Entertainer of the Year at the ACM Awards, and with his exciting comeback, he's been much talked about in the country circuits. With a tour that's spanning three years and breaking records left and right, not to mention a new album, Man Against Machine, out and another one on the way, Brooks is making up for the time since his retirement in 2000.

Jason Aldean had a great year, with his 2014 release, Old Boots, New Dirt, becoming one of only two platinum-certified country records last year. It also debuted at No. 1 across all genres -- quite a feat for a country artist -- and Aldean took some real risks on the record, shying away from a typical country album.

“Just because I’m a country artist doesn’t mean I don’t hear things in other forms of music that I think are really cool and could work for what we’re doing here,” he explains.

The singer’s 2015 Burn It Down Tour is set to partner with Kenny Chesney‘s The Big Revival Tour for some stadium dates this summer, making it one heck of an entertaining event.

Luke Bryan won Entertainer of the Year at the ACM Awards in 2013, and he's the current CMA Awards Entertainer of the Year. His That's My Kind of Night Tour was one of the biggest tours, among all genres, in 2014. And, to top off his amazing year, Bryan got his own Country Music Hall of Fame exhibit.

Miranda Lambert was nominated for Entertainer of the Year in 2013 and 2014 and is the reigning ACM Awards Female Vocalist of the Year for the past five years. She has eight nods at this year's ACMs -- the most of any artist -- giving her a definite advantage in possibly taking home a trophy. Lambert's fifth studio album, Platinum, made her the first artist in history to start her career with five No. 1 records, and earlier this year, she nabbed her second Grammy Award, for Best Country Album.

This is Florida Georgia Line's first time being nominated in this ACM category, but the duo is no stranger to winning at this awards show, taking home New Vocal Duo or Group of the Year, New Artist of the Year and Vocal Duo of the Year, all in 2013. They released their sophomore and certified-gold album Anything Goes in 2014, and its first single, "Dirt," was a little off the beaten path for FGL, giving fans a more personal, introspective version of the duo. They headed out on their first worldwide headlining tour in January.

Which artist should take home Entertainer of the Year at the 2015 ACM Awards? Vote as often as once an hour in the poll below until the end of the day on April 15. We’ll tabulate the results and use them for our 2015 ACM Awards winners predictions the week before the show. (You can also officially vote for Entertainer of the Year beginning on April 8.)

The 2015 ACM Awards will air live from AT&T Stadium in Arlington, Texas, on April 19 at 8PM ET on CBS.