Kacey Musgraves and Katy Perry perform during CMT Crossroads

April 18: Kacey Musgraves and Katy Perry perform onstage during CMT Crossroads: Katy Perry And Kacey Musgraves at Sony Pictures Studios in Culver City, California.

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"It's cool to step out of my zone and write for somebody else," Musgraves says of working with her new touring partner.

Kacey Musgraves is headed into her 14-show stint with Katy Perry with confidence and momentum -- even if some fans might be scratching their heads about what a country artist is doing in the pop candyland of the Prismatic Tour.

"It's going to be really interesting and really good for me, I believe, 'cause there are a lot of people who would probably never have heard country music otherwise," Musgraves, who starts out with Perry on Sunday (Aug. 10) in Grand Rapids, Mich., tells Billboard. "So I'm proud to be an ambassador, and if I pick up some new fans along the way, I think that's great. I think with Katy, with her music and style, anything goes, and I think if people are just coming to hear great music and have a great time, it'll make sense."

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Musgraves and Perry have been friends since Perry tweeted love for "Merry Go 'Round," the platinum first single from Musgraves' gold 2013 album Same Trailer Different Park. "I've been a fan of hers since she came out and just really dug her, and the fact that you can tell she is who she is, which is something I really admire," Musgraves says. After the tweet the two got in touch with each other and have even written a song together, as well as taping an episode of CMT's "Crossroads" earlier this year. "I brought some ideas, and we actually ended up writing a pretty cool song," Musgraves says. "It's loosely based on Dorothy's version of The Wizard of Oz, her being in love with the Tin Man, but he didn't have a heart. And hopefully maybe something will happen with it down the road. Either way, it's cool to step out of my zone and write for somebody else."

Of course, Musgraves is primarily writing for herself and is beginning to eyeball a follow-up to Same Trailer Different Park, although she's hoping a fifth single will follow the current "Keep It To Yourself" and keep the album alive for a little while longer. "There's a batch of songs I'm really digging right now, but nothing is taking specific shape," she reports. "I try to write whenever I can, but it's kind of hard to do that on the road. So I'm going to sit in Nashville, probably, or maybe take a trip somewhere with a bunch of writers I like in the fall, September or October, and see what we get. If something's taking shape, I'll go in and try to capture something again."

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And unlike Same Trailer Different Park, Musgraves says she's well aware many more and ears will be waiting for whatever she does next.

"There's going to be a lot more opinions flying around this time," she says with a laugh. "I try to believe that just because there's more people watching you and what you're doing that doesn't mean you should change it. I just want to stay true to what I set out to be, which is a songwriter writing good songs, not following any trend or trying to make music to get on the radio. I just want to make great music that old people will like, young people will like and hopefully I'll do that again."