Although Coldplay earned a Best Rock Album Grammy for 2008 album "Viva la Vida or Death and All His Friends" and scored a hit with its single "Viva la Vida," the band appears to be thinking even bigger for its in-the-works fifth album.

Frontman Chris Martin recently told BBC News that the band is hard at work on its first concept album and collaborating with producer Brian Eno.

"It's from the point of view of two people who are a bit lost," says frontman Chris Martin. "Two like-minded outsiders who meet in a very difficult environment and therefore have a journey together."

Last September, Martin revealed that the group was close to finishing a handful of songs but that a new album would not be coming out anytime soon. Since then, the group has spent a good amount of time in the studio, with Eno helping the foursome sketch out the music while Martin works on the lyrics.

While the still-untitled album has no release date, Coldplay recently released the holiday-themed song "Christmas Lights" and a video for the track to tide their fans over. The band will also play a pair of " hidden gigs" in the U.K. in the week before Christmas to raise awareness to the country's homelessness rate.

"I think it will be good for us to get our gig feet on for a couple of days because sometimes you can get very institutionalized in the studio," says Martin.