Blake Shelton is getting very honest about the details of his new album. If I'm Honest includes 15 songs — the most he's ever had on a record. During the song selection process, Shelton says there was much debate over which needed to make the final cut.

"We really sat down and went, ‘OK, what are we not going to put on this record?, and it led to some of the biggest fights that we’ve had as a team,” Shelton says, speaking of the battles with his management and record label. “And I’m not kidding – full-on, have-to-leave-the-room arguments - till we finally went, ‘You know what? We all have our favorites and if they mean that much to all of us, let’s put ‘em all on it.’ And it’s true, screw it, who cares?"

One song in particular, "Every Time I Hear That Song," Shelton admits has an influence from fellow coach on The Voice, Adam Levine.

”It’s not like anything else I’ve ever recorded before and I’ll be totally honest — as hard as it is for me to say this — it’s got a little Adam Levine influence in it,” the country star shares. “It’s hard to admit. I hope he doesn’t read this because he’d be like, ‘Hahahahahahaha! I’m your hero!’ But melodically it kind of reminds me of something he would do. It’s obviously country, but when people hear the song, they’ll understand what I’m talking about if they’re familiar with his music."

In addition to a Gwen Stefani duet on "Go Ahead and Break My Heart," one of Shelton's favorite bands, Country Music Hall of Famers the Oak Ridge Boys guest on the album. The comical "Doing It to Country Songs" was written by Paul Overstreet and made for great fun in the studio.

"They are so sweet and so professional and they work so hard,” Shelton reveals. “We finally had to go like, ‘Guys, it’s good, it’s good enough! I mean, you can’t get it better!’ until finally it’s like, ‘Man, I’m tired! You guys nailed it on the second take anyway.’ But they were having so much fun and they just wanted it to be as good as it can be, and this is one of the most special moments of my career to be able to have a duet with the Oak Ridge Boys."

Shelton's If I'm Honest is out May 20.

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