In the United States, the album debuted at number one on the Billboard 200 selling 108,000 copies during its first week of release, Lovato becoming the eighth solo artist to top the chart under the age of 18.

[1] Since its release, the album has sold over 500,000 copies in the country, and has been certified Gold by the Recording Industry Association of America (RIAA).

Lovato was discovered by the Disney Channel during an open call audition in her hometown of Dallas, Texas and made her debut on the short series As the Bell Rings in 2007.

[3] Lovato enlisted the Jonas Brothers, her Camp Rock co-stars, to work with them on her debut studio album, Don't Forget (2008).

[2] In January 2009, Lovato announced to MTV News that she had already begun writing songs for her second studio album, as well as revealing its approach: "It's going to take a different sound, so hopefully it goes over well.

[9] As she wanted to accomplish more "John Mayer-ish type of songs",[8] she contacted Mayer's management in order to collaborate with him, citing him as one of her biggest musical influences.

[2][13] In an interview with Women's Wear Daily, she explained: "When I took a step back, I realized I wouldn't like those subjects being talked about in somebody else's home, with a seven-year-old and her mom.

[13] The song later appeared on her third studio album Unbroken released in September 2011, when Lovato had left Disney Channel.

[14] Unlike her first studio album, Don't Forget, Lovato did not collaborate with the Jonas Brothers on Here We Go Again as she wanted to see what her sound would be like without their input.

[24][25] Speaking to New York Daily News, Lovato said that the album's musical style includes "less rock and more mellow stuff", with a twist of R&B.

[16] "U Got Nothin' on Me", another SuperSpy production, includes influences of 1980s glam metal, in this song, Lovato reminisces a summer romance that took a tumble which takes a toll on their relationship, but in the end, she realize she's fine on her own.

[16] The ninth track, "Stop the World", was co-written by Lovato and Nick Jonas about falling in love with someone, but "people don't want you to".

[16] The second bonus track, "So Far, So Great", was written and produced by Aris Archontis, Jeannie Lurie and Chen Neeman and served as the theme song of Sonny with a Chance.

[29] On July 17, 2009, Lovato appeared on The Tonight Show with Conan O'Brien to perform the album's title track.

[31][32] To promote the album's UK release, Lovato appeared on radio BBC Switch and logged into Habbo Hotel to chat with her British fans in January 2010.

[33] She was also interviewed on British television programs such as Blue Peter, Daily Fix Chart Show, Live from Studio Five, Freshly Squeezed and T4.

The tour began on June 21, 2009, in Hartford, Connecticut and previewed new songs from Here We Go Again, including "Remember December", "Stop the World" and "U Got Nothin' on Me".

[34] It was confirmed on April 15, 2009, that David Archuleta would serve as the tour's opening act, with singer Jordan Pruitt and girl group KSM joining on select dates.

The song peaked at number 80 on the UK Singles Chart and received generally positive reviews from critics, who praised its hook and chorus.

[17][24][43] "Remember December" was directed by Tim Wheeler and features guest appearances from Lovato's female co-stars in their upcoming television film Camp Rock 2: The Final Jam.

"[26] Rating the album three and a half stars, Stephen Thomas Erlewine of Allmusic noted the album's "mature veneer" and the "subtle shift buried underneath the relentlessly cheerful Radio Disney production and Lovato's irrepressible spunk", writing that "Both sonic characteristics tend to camouflage Demi's biggest moves away from teen pop.

[24] The Arizona Republic critic Ed Masley gave the album three and a half stars and recommended it for power pop fans.

[45] Entertainment Weekly's Simon Vozick-Levinson graded the album B− and praised the "hard-edged" tracks such as "Got Dynamite", calling them suggestions of "a direction that might set her apart in years to come".

"[22] Kerri Mason of Billboard praised the album for not relying heavily on production and Auto-Tune, calling Lovato "a natural talent who could really take flight after outgrowing Disney".

[27] Mason wrote that the album includes "quiet surprises" and potential hits, particularly praising the title track and "Catch Me".

[27] Jeff Miers from The Buffalo News rated Here We Go Again two and a half stars out of four, writing: "Unlike so many of her Disney-fied peers, Lovato can really sing, and part of what makes her sophomore effort appealing is the lack of in-studio vocal manipulation.

[46] Allison Stewart of The Washington Post referred the album to as a "smart, bristly, busy sophomore disc", writing that "Too much of it apes Avril Lavigne, with the standard shouted choruses and hiccupped verses that are beginning to sound very '03.

[19] Awarding the album five out of ten points, Cody Miller of PopMatters was mixed in his review and said that Lovato "desperately wants to be Kelly Clarkson", writing "Lovato can't work miracles with mediocre pop songs like Clarkson, but the young singer-actress has a bigger range than any of her contemporaries, and a better sense of on-record charisma.

"[17] He concluded his review: "Here We Go Again isn't perfect by any means, and when compared to someone like Clarkson or Pink, it's obvious the young singer has lots of work ahead of her if she wants to truly cement herself as a serious, viable pop/rock artist outside of the Disney mold.

"[17] Rolling Stone gave the album 3 stars out of five, saying "Lovato has chops and spunk akin to a fellow Texas pop singer, though her voice doesn't churn with Kelly Clarkson's gutsy heart yet.