You Lost Me

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"You Lost Me" is a song by American singer Christina Aguilera from her fourth studio album Bionic. Described by Aguilera as the "heart of the album," the song was written by Christina Aguilera, Sia Furler, and Samuel Dixon, who also produces the song. The song speaks lyrically of an unfaithful man, who has left the world in view of Aguilera as "infected." It was released on June 29, 2010, and July 6, 2010, on iTunes.

The song received praise for its great vocal capacity after its announcement. MTV TV described it as the heart of the album, while Billboard magazine noted that the song and video are polar opposites to the first release of Bionic, the single "Not Myself Tonight." Commercially, the performance of the song was weak, failing to enter the Billboard Hot 100 but managing to position itself at number one on the Billboard Hot Dance Club Play list. In Israel, it reached its best position in the top 10 of the country's main list, while in the Netherlands, it achieved moderate success, entering the chart at number 91 and later returning to the list at post 79 two years after its initial release.

The collaboration between Aguilera and Sia was facilitated by Aguilera's management team, who contacted Sia about working together. In an interview, Sia reported that she had previously asked her directors in contact with Aguilera to collaborate on a track called "Death by Chocolate," but it did not happen until they worked together on "You Lost Me." Aguilera expressed her admiration for Sia's work and was excited to collaborate.

"You Lost Me" was announced as the third single in the US and the second internationally from Bionic, with "I Hate Boys" set to be released as the second single in Australia. The song's cover artwork was revealed three days after its announcement via Aguilera's official website. RCA Records officially released the song to US contemporary hit radio on June 27, 2010.

The song features a piano and string instrumentation and has a tempo of 50 beats per minute. Lyrically, "You Lost Me" talks about a cheating man who has left Aguilera's world "infected." The song begins with a somber orchestral piano opening before moving on to the lines "I'm done, smoking gun/