What: Indubious album release party, with Resurrector

When: 8 p.m. Friday

Where: Volcanic Theatre Pub, 70 SW Century Drive, Bend

Cost: $12 plus fees in advance, $15 at the door

Contact: volcanictheatre.com or 541-323-1881

For more than a decade, Oregon reggae/rootstronica band Indubious has operated under the motto, “live indubiously.”

But brothers and co-bandleaders Evan “Evton B” and Spencer “SkipWicked” Burton have never been uncertain about their calling in life. The two grew up in a musical family: Their mom and uncle played together in a band, while their dad was a “reggae music fanatic.” During a recent interview with GO! Magazine, Evan Burton couldn’t recall a time when music wasn’t his or his brother’s main passion.

“I had this thing — it’s this paper that I wrote in fifth grade,” Evan said recently from home in Bend, where the group has been based for the last four years. “This was a past-and-future thing, and so the future one was me seeing myself 20 years in the future. This was before I even played music, and I wrote this whole thing; it’s really trippy. This was when I lived in California, and I said this story about how I moved to Oregon and I live in this green house and I have a studio in my backyard and me and my brother are in a reggae band. And the whole thing totally came true.”

Not only that, but the brothers have experienced their biggest success to date with fifth album “Beleaf.” Released last month, the album peaked at No. 1 on Billboard’s Reggae Albums chart in its second week of release. The band’s previous album, 2017’s “From Zero,” peaked at No. 6 on the same chart.

Indubious — Evan on keyboards and vocals, Spencer on bass and vocals and drummer Matty T. Narmis — will play a hometown album release show at Volcanic Theatre Pub on Friday.

Like “From Zero,” “Beleaf” was recorded at Evan’s home studio. But whereas the group labored over the music in the past, the songs on “Beleaf” came about more spontaneously. The songs on the album flow together and expand the group’s traditional reggae and electronic sound with elements of funk, soul and R&B.

“In the past, writing and producing music has been this long, painful experience,” Evan said. “You overthink it, and it becomes this very intellectual process, and then you’re also trying to consider what you want it to sound like and what you want people to hear. And you’re listening to other music, like, ‘Oh, I want my music to sound like this band’s music because they’re popular.’ At a certain point — it’s taken years and years of building our confidence as people and musicians to say, ‘Hey, we’re just gonna do exactly what we want to do.’ … This album is the clearest expression of that.”

The album’s title references the personal struggles Evan and Spencer have dealt with since birth. The siblings were born with cystic fibrosis, and while Evan planned out his future 20 years down the line in his fifth-grade essay, doctors had been telling the boys that they wouldn’t live past 18.

“That’s the energy that we grew up with, so we had no choice but to go, ‘OK, well, people tell you things, and there’s a reality out there that other people see, but if that doesn’t feel like the right reality to you, it doesn’t have to be,’” Evan said. “We create our own reality through our perception and our beliefs. Belief is the strongest thing that guides us, and it becomes self-fulfilling. It becomes a prophecy that you self-fulfill, so why not believe something good?”

Evan received a double-lung transplant in 2011; by that point, Indubious released two records, 2008’s “Fresh Leaves” and 2009’s “Cosmic Seed.” The disease led the brothers to adopt a healthy lifestyle to survive grueling tours and recording sessions.

“Most people view the road as the big party, right — ‘Oh, we’re gonna go out and get (messed) up and drink and do drugs,’” Evan said. “We just can’t really do that. It has to be sustainable; it has to be healthy. We have to get sleep; we gotta eat good food. We’ve gotta take care of our vessels first. … For me, I believe in a meaning and purpose behind all things. People see this disease as a curse, (but) we see it as a blessing because it essentially keeps us grounded. It keeps us in alignment with what we’re doing.”

And what Indubious does goes beyond music, Evan said.

“This is a realm where we can get real esoteric,” he said. “… In my heart, I’m a mystic; I’m a teacher; I’m a kind of shaman of sorts. My music is essentially just the vessel through which I bring my message, and my message is one that I’ve cultivated throughout my lifetime because life called upon me to become greater and greater because of the challenges that it’s given me. … It’s essentially brought me to a sense of the impermanence of the time that we have here, and being called to essentially really follow my dreams.

“That’s living indubiously, as they say,” he added. “Living without fear and doubt, and full certainty that we are the creators of our experience and we’re here for a reason.”