"Sorry" is a song by American singer Madonna from her tenth studio album Confessions on a Dance Floor (2005). It was written and produced by Madonna and Stuart Price, and released as the second single from the album on February 7, 2006. It later appeared on Celebration, her 2009 greatest hits album. An uptempo dance song, "Sorry" was one of the first tracks developed for the album and had numerous remix treatments before the ultimate version of the track was finalized. One of the remixes was done by the Pet Shop Boys, featuring added lyrics by the band. The actual song features a dance groove tempo. It talks about personal empowerment and self-sufficiency.

"Sorry" received positive reviews from contemporary critics, who declared the track the strongest song on Confessions on a Dance Floor. Some critics also commented on the song's disco-influenced beats while comparing it to Madonna's older dance songs. It achieved commercial success, topping the singles charts in Italy, Spain, Romania and the United Kingdom, where it became Madonna's twelfth number one single. Elsewhere, the song was a top ten hit. However, in the United States, the song did not perform well due to an underplay on radio but was able to reach the top of Billboard's dance charts and became one of the decade's most successful dance hits.

The accompanying music video, directed by Madonna's choreographer Jamie King, was a continuation from the "Hung Up" music video. It featured Madonna and her dancers roaming around a city in a van, dancing on roller skates and Madonna fighting with a group of men in a cage. She performed the song on her 2006 Confessions Tour in a similar fight sequence to that shown in the video. An additional video was created as a backdrop for a remix of the song, which depicted political leaders and scenes of war and destruction.

"Sorry" was one of the first tracks developed for Confessions on a Dance Floor, along with "Hung Up" and "Future Lovers". It was also the one which took the most time to finish because Madonna "thought it was too melodramatic and could never decide when it was right." The songs were developed with a remixed perspective in mind. Madonna commented that, "Whenever I make records, I often like the remixes better than the original ones. [...] So I thought, screw that. I'm going to start from that perspective". She promoted the album at the dance party "Misshapes" held at Luke & Leroy's nightclub in Greenwich Village, invited by Junior Sanchez to take over the DJ booth where she mixed "Hung Up" with "Sorry". Musically, "Sorry" is an uptempo dance song containing layers of beats and strong vocal on the chorus. It is set in common time with a moderately fast dance groove tempo of 132 beats per minute. Composed in the key of C minor, Madonna's vocal range spans from F₃ to G₄. It follows the chord progression of E♭–Cm–A♭–B♭ during the spoken introduction. It then changes to Fm–Gm-Cm in the chorus, while continuing in A♭–Cm–A♭–Fm in the intermediate verses, ultimately ending in repeated lines of "I've heard it all before".

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