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NBC has revealed the celebrity mentors for "The Voice" season 15, and the choices are interesting. New photos provided by the network reveal that Halsey, Keith Urban, Thomas Rhett and former coach CeeLo Green will be next season's advisors. See the photos in the slideshow above.

Green will work with Adam Levine's team, while Urban is collaborating with Blake Shelton's team, Halsey joins returning coach Jennifer Hudson's team, and Rhett is with defending champion Kelly Clarkson's team.

The selections of Urban and Rhett mean that half of the advisors in season 15 will be country artists, which plays into the show's perceived lean toward country music fans. Shelton is the show's most successful coach, with at least the runner-up in ten of the first eleven seasons, most of which were country artists. Having two country artists as mentors certainly won't help the belief that "The Voice" is skewing country.

Related: Kelly Clarkson could go from 'The Voice' to daytime talk show

But even more interesting than that is the selection of Green as Levine's advisor. He was one of the show's original coaches for the first three seasons and then the fifth season, but in 2014 said he was done with the series. However, the very next year he reversed course, telling The Associated Press he wanted to be back on "The Voice." He has also made multiple guest appearances since the end of his coaching tenure. It's intriguing to see him go from tired of the show to having a prominent role in the new season, and it also likely won't be without controversy given some of his past remarks.

Yet when it comes to choosing advisors, "The Voice" tends to look for artists who will bring buzz for TV viewers, and there's no denying Green will give audiences a lot to talk about, from his own personality to how his coaching methods may have changed since the last time he appeared on the show. Urban has a wealth of knowledge to give to new artists plus experience as a former "American Idol" and "The Voice Australia" judge, and Halsey and Rhett are both still on the upward swing of their careers. These four singers will all attract attention when they make their "Voice" debut during the season 15 battle rounds, which will air later this fall after the blind auditions.

"The Voice" season 15 premieres Monday, Sept. 24 at 8 p.m. on NBC. For more on any of the season 15 coaches and advisors, including when and how you can see them live this year, click their names above to visit their artist pages at AXS.