David Archuleta went on hiatus from his music career to volunteer as a Mormon missionary, and he returned to add his vocals on a new song for the upcoming Mormon documentary "Meet the Mormons."

Archuleta, a devout member of The Church of Jesus Christ of Latter-day Saints (LDS), sings the song "Glorious" for the film, according to The Huffington Post. A music video has the "American Idol" star singing in a recording studio cut between scenes of people across the world.

"It's like a symphony just keep listening/And pretty soon you'll start to figure out your part/Everyone plays a piece and there are melodies/In each one of us, oh, it's glorious," Archuleta sings.

Archuleta finished second on "American Idol's" seventh season in 2008. He released six albums before he entered the Provo, Utah Missionary Training Center in March 2012. He spent two years at the Chile Rancagua Mission, where he learned to speak Spanish and spread the LDS gospel, according to The Huffington Post.

"I think the biggest thing I'm learning as a missionary... is not to be afraid," Archuleta said in a documentary about his experience entitled "David Archuleta - Called to Serve." "The gospel is all about change, and I didn't realize I would be applying that to myself."

"Meet the Mormons" will premiere in select theaters on Oct. 10. The documentary highlights six members of the church across the globe, and attempts to challenge "the stereotypes that surround the Mormon faith," according to the movie's website.