"Never Again" is a song recorded by American pop singer Kelly Clarkson for her third studio album, My December (2007). Clarkson co-wrote the song with Jimmy Messer while produced by American producer and musician David Kahne. Clarkson stated that the song was written as a counterpart to the songs from her second studio album, Breakaway (2004), and was almost removed because of its harsh lyrical nature. RCA Records serviced the song to mainstream radios in the United States on April 24, 2007. "Never Again" features a stronger rock sound than Clarkson's previous releases, but maintains some pop undertones. It relies on strings, guitar riffs and drums and is centered on angry, abrasive lyrics.

"Never Again" received positive reviews from music critics, with many citing it as a darker counterpart to "Since U Been Gone" (2004) and as one of her best releases. The song fared well in international as well as domestic markets, but failed to mimic the success of her previous lead singles. It peaked at number eight on the Billboard Hot 100 and was certified gold by the Recording Industry Association of America (RIAA). It was also certified gold in Canada and Australia while peaking within the top ten in both regions. The song has sold over one million downloads in the United States. The accompanying music video for "Never Again" was released on May 1, 2007 in the United States. It portrays Clarkson being drowned in a bathtub and in various scenes acting as a ghost, haunting her ex-boyfriend following the end of their relationship.

"Never Again" was written and composed by Kelly Clarkson and Jimmy Messer while American producer and musician David Kahne produced the song with Messer and Jason Halbert. The song was conceived around the same subject as "Since U Been Gone" and "Behind These Hazel Eyes", which were included on her second studio album Breakaway (2004). The song was written as a contrast to those songs, saying that "neither was originally written" with that thought in mind and were adjusted "after the fact." It was almost removed from My December's track listing, but Clarkson found to be fitting as the album's opener, stating "it's a fun song, and that's why we kept it. It's just got such great energy. It's so blunt — I was so angry — and it reads so well, so we just went with it." Kahne also provides the keys, along with Halbert, and Messer provided the guitars. The instruments were played by Billy Mohler, who plays the bass, and Shawn Pelton, who provides the drums.

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