Ones (Spanish: Unos) is a compilation album by American Tejano singer Selena, released in the United States on 1 October 2002 by EMI Latin. It was released on 11 November 2002 in Spanish-speaking countries, while the limited edition included a bonus DVD of her music videos. Ones was released building on the popularity of the 1997 biographical film Selena. The singer's father Abraham Quintanilla Jr. and sister Suzette Quintanilla told CBS TV host Julie Chen that the album was aimed at Selena's new generation of fans. Ones was released as part of the Selena: 20 Years of Music collection—a nine-disc series of her studio, live, soundtrack and compilation albums. The recording features six number one singles namely, "Amor Prohibido", "Bidi Bidi Bom Bom", "No Me Queda Más", "Fotos y Recuerdos", and her duets with Álvaro Torres on "Buenos Amigos" and the Barrio Boyzz on "Donde Quiera Que Estés".

Selena's brother, A.B. Quintanilla III, remixed three of her singles ("Amor Prohibido", "Como la Flor" and "Si Una Vez") into a medley mash-up entitled "Con Tanto Amor Medley", the same tracks found on the album. The track was released as a promotional single to radio stations, and received a mixed response from music critics. The album also received a mixed reception, with Jon O'Brien of AllMusic noting that the record label ignored Selena's self-titled debut album from the track listing on Ones. The recording peaked at number two on the US Billboard Top Latin Albums and number one on the Latin Pop Albums charts. Ones peaked at number 159 on the Billboard 200 chart and was certified gold by the Recording Industry Association of America (RIAA), signifying shipments of 500,000 copies in the United States.

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