"Mi Delirio" (English: "My Delirium") is the lead single of Mexican actress, singer Anahí from her fifth studio album Mi Delirio (2009). The song has a mixture of Dance-pop and Electronic music. It was released on digital download on August 14, 2009 through EMI Music. It is a band of electropop genres, pop and dance-pop. Your Letter covers topics such as power, seduction and madness.

The singer arrived to work the song on several occasions, even as part of the promotion of the album. The first presentation took place during the 2009 edition of Premios Juventud, on July 16 of that year. The song then was named to two award categories. having not won at all. In Brazil, with the Mi Delirio World Tour, the song was first performed on November 2, 2009 during the participation of the interpreter in the Programa do Jô.

The official video clip of the single, directed by Max Gutierrez, was issued on 15 November 2009. It features Anahí in a mental hospital where the singer appears wearing black lingerie. Soon after the release the video was censored in some countries of the world through YouTube for "inappropriate content." The video reached number one of the most requested videos of Brazil, by MTV, which no Mexican artist had achieved before. The impact the singer earned two nominations to targeted categories will videos, one for the Premios Juventud and one for Latin Orgullosamente.

The song was written by herself, Gil Cerezo, Ulises Lozano members from Mexican band Kinky and Miguel Blas, it was produced by Gil Cerezo and Ulises Lozano and it's her first solo single since she released her last album Baby Blue in 2000 after almost ten years without a solo album, "Mi Delirio" was performed first time in Premios Juventud 2009 on July 16 in Miami, Florida and was used to close the show. Back later the song was included on her mini promotional tour Anahí Promo Tour started on August 7, 2009. The official remix features Ken-Y by reggaeton duo R.K.M & Ken-Y was leaked onto the internet and YouTube on December 1, 2009, this remix was produced by Myztiko . An acoustic version was also made on December, 2009, which was included in the album "Mi Delirio Deluxe". Another remix was leaked on January, 2010 called "The Kinky remix".

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