Answer by taking a quote from the following article:

Fleet Foxes is an American indie folk band formed in Seattle, Washington. Their first two albums were released by the Sub Pop and Bella Union record labels, with their third by Nonesuch and Bella Union. The band came to prominence in 2008 with the release of their second EP, Sun Giant, and their self-titled debut album. Both received much critical praise and reviewers often noted the band's use of refined lyrics and vocal harmonies.

Pecknold said that he would have liked the album to be released in 2009; however, the band's touring schedule delayed rehearsals of the new songs until February 2009. These sessions took place in a rented house outside Seattle, but were mostly scrapped, losing the band $60,000 of their own money. Further delays ensued because the drummer, Tillman, was scheduled to play a solo tour in Europe and North America throughout the 2009-10 winter. Pecknold later sent some demos to producer Phil Ek and expressed the hope that the second LP would emerge in late 2010.  In December 2009, Pecknold said he wanted the new LP to sound "less poppy, less upbeat and more groove-based". He referenced the 12-string guitar sound from Roy Harper's folk album Stormcock, saying, "That will be the primary sonic distancing from the last record." He wanted the band to record very quickly, with "vocal takes in one go, so even if there are fuck-ups, I want them to be on there. I want there to be guitar mistakes. I want there to be not totally flawless vocals. I want to record it and have that kind of cohesive sound. Van Morrison's Astral Weeks, to me, is the best-sounding album because it sounds like there were only six hours in the universe for that album to be recorded in. So I want it to have that feeling." The band eventually began recording in April 2010 in various locations (including West Hurley, New York) and decided to scrap the earlier idea of a fast recording (though according to the band many of the initial vocals were done in one take). The album features a new six-piece band line up, with the addition of the former Blood Brothers bassist Morgan Henderson on upright bass and woodwind instruments.  The album, Helplessness Blues, was released on May 3, 2011 with a cover illustrated by the Seattle artist Toby Liebowitz and painted by Christopher Alderson. The title track was released via free download on January 31, 2011, and the album's fourth track, "Battery Kinzie", was premiered in the UK on Zane Lowe's radio show on March 22, 2011. The Sub Pop record label released a downloadable music video of the track "Grown Ocean", with footage of the album's recording, on its website in support of the album. A 12" vinyl double A-side single of "Helplessness Blues" and "Grown Ocean" was released for Record Store Day on April 16, 2011. On November 1, 2011, Pecknold's brother, Sean Pecknold, released the official music video for "The Shrine / An Argument".  On January 18, 2012, after the band had finished touring for the album, drummer Tillman announced that he had left the band. He would go on to reinvent himself and record several albums as Father John Misty, notable for his ironic sense of humor in lyrics and media as well as often criticizing both the record industry and society in interviews and on stage.  Helplessness Blues was nominated as Best Folk Album at the 2012 Grammy Awards, held February 12, 2012.

What did they do after this album?
The album, Helplessness Blues, was released on