Following the success of MercyMe's previous studio efforts and their surprise crossover hit "I Can Only Imagine”, they were given significantly more resources to develop the album with.

Undone has been certified Gold by the Recording Industry Association of America (RIAA) and has sold over 627,000 copies in the United States as of April 2006.

Three singles ("Here with Me", Homesick", and "In the Blink of an Eye") were released in promotion of Undone, all of which topped at least one Christian chart format.

[2] One major change the band made was adding a sixth member, guitarist Barry Graul, who had previously worked with Whitecross and Jaci Velasquez.

[2][3] Although the band remained committed to being a Christian group and refused to change the lyrical content of their songs or approach to interviews and concerts, they did decide to make some changes; they decided to work with outside songwriters as well as to employ the London Symphony Orchestra to play strings on four tracks.

[2] Mike Scheuchzer, one of MercyMe's guitarists, described their musical approach as having grown "twice what we grew between Almost There and Spoken For", something the band didn't expect.

[4] Although he did not focus less on Christian lyrical material for Undone, Millar said he did consider mainstream radio during the songwriting process.

Additionally, he avoided using Christian jargon, as he felt people who are not regular churchgoers might not understand what those terms mean.

[5] MercyMe still felt called to be a worship band, however, and described mainstream success as "icing on the cake".

This impacted the band's songwriting process; Millard noted that "there's a lot of personal stuff on [the album] about the things we've gone through and how Christ has been the solution".

The first incident occurred during the holiday season of 2004; a friend of Millard's had a miscarriage of twins and was so far along in the pregnancy that doctors had to induce labor.

[4] Undone was produced by Pete Kipley and was recorded by F. Reid Shippen, Mike O' Connor, and Steve Bishir; recording took place at Blueberry Hill, Sound Stage, Abbey Road, The Indigo Room, Maximedia, Luminous Sound, and The Schwoodio.

[7] Mixing was conducted by F. Reid Shippen and Lee Bridges, while mastering was done by Ted Jensen at Sterling Sound.

[7] The string tracks on "Homesick", "Where You Lead Me", "Unaware", and "Here with Me" were arranged by Rob Mathes and recorded by Simon Rhodes and Andrew Dudman at Abbey Road.

[8][11] It maintains the band's style from their previous albums, with elements like string instruments and influences from Britpop.

[9] Everything Impossible" adopts a similar musical style, but has a more "propulsive" beat and an instrumental break driven by power chords.

[3] More upbeat cuts on the album include "In the Blink of an Eye", "Caught Up In The Middle", and "A Million Miles Away",[8] while "Keep Singing" only features piano and vocals.

[5] The song was regarded as a safer choice for mainstream radio, as it was not quite as explicit in its religious themes as "I Can Only Imagine".

Although some critics felt the songwriting and music were too similar to the band's previous efforts,[8][22] others praised the album's 'personal' style.

[10] Johnny Loftus of Allmusic gave it three out of five stars, saying that "With its slick production and MercyMe's full lineup of guitars, percussion, and keys, [Undone] suggests the tangent of Nashville contemporary country that favors straightforward pop melody over any sort of hard twang.

Likewise, the album's more upbeat moments reflect the trend in secular adult alternative toward earnest vocals over whitewashed rock (à la Vertical Horizon).

Both sounds work well for MercyMe on Undone, doubtless giving fans of the band's music and devotion plenty more to believe in".

[9] David McCreary of CCM Magazine gave Undone an A, calling it "[MercyMe's] most mature, personal recording to date", also praising Bart Millard's vocals as well as the album's production value.

[3] Deborah Evans Price of Billboard called the album "an impressive collection filled with great songs and solid performances".

She praised Millard's vocals and the album's lyrics and production, said it should appeal to both Christian and mainstream listeners, and called MercyMe a band "too good to be limited to one genre".

[24] All tracks are written by Jim Bryson, Nathan Cochran, Barry Graul, Pete Kipley, Bart Millard, Mike Scheuchzer and Robby Shaffer except where noted.Credits adapted from the album liner notes.