Fans of Kansas can probably rattle off a dozen of the rock band’s most iconic songs from memory, but the musicians credit one track in particular with changing the course of their careers: “Carry on Wayward Son.”

The song, written by Kerry Livgren for Kansas’ 1976 album “Leftoverture,” became the band’s first Top 40 hit and has subsequently been featured in countless films and TV shows — including every season of the CW’s demon-hunting horror series “Supernatural,” where it has become the show’s unofficial anthem throughout its 10 years on the air, even spawning a poignant cover version in the drama’s musical 200th episode.

Last year, to commemorate the 40th anniversary of their self-titled debut album, Kansas’ original lineup (Phil Ehart, Dave Hope, Kerry Livgren, Robby Steinhardt, Steve Walsh and Richard Williams) reunited for the first time in more than 30 years, resulting in a new documentary that promises to take fans and music aficionados on a previously untold journey through the landmarks of the band’s career. Below, Variety has an exclusive clip from the doc, “Miracles Out of Nowhere,” in which the musicians recount the impact that “Carry on Wayward Son” had on their lives.

The film, which recently had its worldwide premiere at the Santa Barbara Film Festival, will be released on March 24, and is available for pre-order through its website and Amazon. An advance screening of the doc will take place in Los Angeles at 6 p.m. on Thursday, February 19, at the Jimmy Stewart Building, Screening Room 24, located at on the Sony Pictures Lot. Contact the documentary’s publicist for further information.

Directed by Emmy-nominated helmer Charley Randazzo, “Miracles Out of Nowhere” combines interviews with rare and unseen footage, including live performances, taking viewers back to the band’s hometown, Topeka, Kansas, and revealing the artists’ memories of touring, songwriting and recording, including how the smash hit “Dust in the Wind” was just a passing comment away from never being recorded; their experience recording in the studio next to John Lennon; a backstage fight with Aerosmith’s Steven Tyler; and how the words “free beer” changed their lives forever.

In addition to the band’s original lineup, the documentary features interviews from Queen guitarist and former tour mate Brian May, producer Brendan O’Brien and Rolling Stone journalist David Wild. Also featured prominently is country icon Garth Brooks, who counts Kansas, alongside the Beatles and the Eagles, as one of his greatest inspirations.

Watch the trailer for “Miracles Out of Nowhere” below.