Carly Rae Jepsen Lets Fans Write Her Next Song In 'Perfect Harmony' Campaign

'Call Me Maybe' singer will allow 'American Idol' fans to co-write a tune with her.

When a certain soda brand rang up Carly Rae Jepsen to be a part of its "Perfect Harmony" campaign, she took the call. No maybes about it.

The "Call Me Maybe" singer has joined Coca-Cola's "Perfect Harmony" contest, which allows "American Idol" fans to choose lyrics to a tune, written by Jepsen. Once the intro gets release on Wednesday, fans vote between three choices on what lines the singer should belt out next. Music lovers can continue to help her out through the creative process before it wraps up on May 14.

"Well I loved the idea that it was a massive collaboration," she told MTV News. "And, there's nothing better than sort of getting fan feedback. I know even with this past year, it's been a big part of my process, hearing what the fans love. And, it seemed like a crazy challenge to write a song with three different versions to it and allow the fans to kind go choose their favorite and help me create not only that, but the performance itself. It's going to be fun."

Fans will put their two cents in on not only Jepsen's track, but also what it's going to look like when she performs it during the "American Idol" finale — from stage design to her costume. So, when it's all chosen, what would be Jepsen's ideal song and performance?

"Well I created a summer-themed idea and there's three different lyrics options and it's all kind of about the things I love about summer basically," the "Tonight I'm Getting Over You" singer teased. "And then we've created as well some different behind-the-scenes back-up dancer outfits and what we're gonna do for the pyro and lighting, just helping us create the set design as well. It's really way for the fans to kind of engage and be involved in making this performance come to life. So, it's going to be fun."

If you could write Carly Rae Jepsen's next song, what would it be about? Leave your verses in the comments below!