Rodney Crowell and Emmylou Harris are working on a new album together. The two tunesmiths, who released their collaborative 'Old Yellow Moon' in 2013, have already begun to work on their next set of tunes.

“We just decided to do another duet album together, to have some more fun,” Crowell reveals to Relix. “We had a ball working on 'Old Yellow Moon.' We bring out a lot of good stuff in each other. We just understood that we have to have more time to explore that.”

The legendary songwriters, whose career together spans almost 40 years -- since Crowell became part of Harris' Hot Band in 1975 -- are currently working on a song they started almost two decades ago.

“Right now, Emmy and I are collaborating on one song that I started to write 17, 18 years ago,” he reveals. “I’m no good at telling a song what it should be. It will tell me what it wants to be.”

Crowell, who penned his memoir, 'Chinaberry Sidewalks' in 2011, says he is also considering writing another book, although in true Crowell fashion, he says he will remain humble about his accomplishments.

“I will not write about the cool career I have had,” he insists. “If I can figure out how to make it about how my adult years have been spent inside the music business with some creative and cool people, then yes, I’ll do it. As long as it’s not about me.”

In addition to working on a new book and another record, Crowell is also touring in support of his latest record, 'Tarpaper Sky.' The songwriter will head to Massachusetts, New Hampshire and Maine this weekend. See a list of upcoming shows here.