If you go

What: Poor Moon, opening for Beach House

When: 8:30 p.m. Sunday

Where: Boulder Theater, 2032 14th Street

Tickets: $22 in advance, $24 at the door

More info: bouldertheater.com/event/beach-house

F or some, it might come as a surprise that two of the guys from the Fleet Foxes have collaborated to form a new band, Poor Moon.

But the creation and unveiling of Poor Moon wasn't sudden at all. It was many years in the making, and to hear Christian Wargo tell it, it was much too slow.

"We've been done with the album for over a year, so I've just been sitting on it," Wargo said. "I've been waiting for it to come out for a long time, and it's exciting to get to do it, but there's also an element of 'I'm over it.' I'm ready to move on to the next thing."

He definitely seems like the restless creative type. Poor Moon got started with Wargo sending demos to Casey Wescott -- his Fleet Foxes bandmate -- who would return them with arrangements and suggestions. But it sounds like the demoing would be happening with or without a collaborator.

"Demoing in my bedroom is sort of what I do instead of watching TV," Wargo said. "Since I was a little kid, I had a four-track and I'd make jams."

The formation of Poor Moon, the actual coming-together of its members, was a very long time coming, too. Wargo has known Wescott for 14 years, and before Fleet Foxes, worked with him in stints in Pedro the Lion and Crystal Castles.

"Instant friendship," Wargo said. "We met in Chicago when he was passing through town. We had some mutual friends in Seattle and I moved there. We were in various bands together before Fleet Foxes and he was playing with them before I joined, and I was helping him cart his gigantic pianos to shows and going to sessions for demos."

Then there's the other half of Poor Moon, brothers Ian and Peter Murray, who Wargo has known for about 10 years.

"We never really made music together, but I knew they were musical and I knew Peter was a highly skilled guitar player. I knew that he had an attention to detail that would be really cool for the kind of music that I write, which can be kind of intricate at times," Wargo said. "Eventually it dawned on us that we should just be in a band together."

Of course, the question on everyone's mind will be, 'How will this be different from Fleet Foxes?' The one simple answer Wargo points out is that it's a different group of people. He also said Fleet Foxes is singer Robin Pecknold's vision, and he's just there to support it. Poor Moon is Wargo's vision.

"When I was writing some of these songs, I'd never really been in a band where there was an option for me to write for someone else," Wargo said. "The original intention for some of these [songs] was that they would be Fleet Foxes songs, but as time goes on you get a better sense of how things work. It just seemed like not really the direction we want to go."

So, does it sound like Fleet Foxes?

"It goes either way," he said. "It's kind of funny how some people will say this is exactly like Fleet Foxes and other people think it doesn't sound anything like Fleet Foxes."

The best way to settle it, obviously, is to give the self-titled debut a listen and catch Poor Moon at the Boulder Theater, opening for Beach House.