Question:  "Partytime!" is a special promotional CD release by pop singer Gloria Estefan who used to be the lead singer for which band?

Context articles: On Your Feet!
Me Odio
Me Estoy Enamorando (album)
Píntame De Colores
Wepa
Partytime!
Gloria Estefan
The Essential Gloria Estefan
No Llores
Best of Gloria Estefan

On Your Feet!
 is a jukebox musical that played on Broadway at the Marquis Theatre.
 Based on the lives and music of 26-time Grammy Award-winning husband-and-wife team Gloria Estefan and Emilio Estefan, the musical has a book written by Alexander Dinelaris and a score built around the Cuban-fusion pop music made famous by Gloria Estefan, such as "Get on Your Feet", "Conga", "1-2-3" and "Rhythm Is Gonna Get You."
 It also features an original song called "If I Never Got to Tell You," with lyrics by Gloria Estefan and music by her daughter, Emily Estefan.
 After playing on Broadway for two years, Gloria Estefan announced there are several international productions in the works.
 Including an international tour and sit down productions in Germany, Italy, Mexico, Japan and France.
"Me Odio" ("I Hate Myself") is a song recorded by Cuban-American singer Gloria Estefan for her fourth Spanish-language and eleventh studio album, "90 Millas".
 The song was written by Gloria Estefan and her husband, Emilio Estefan Jr. and Gaitanes (Alberto y Ricardo Gaitan), while production was credited to Estefan Jr. and Gaitanes.
 The single was released by SonyBMG on November 2, 2007 digitally worldwide as the second and first promotional-only single from "90 Millas".
Me Estoy Enamorando (English: "I'm Falling in Love" ) is the sixth studio album by Mexican singer Alejandro Fernández.
 It was released by Sony Music Mexico on 23 September 1997.
 It marks a musical style change where Fernández performs pop ballads and boleros as opposed to ranchera music.
 His decision to record a pop album transpired after having aspirations to expand his audience.
 Fernández asked Emilio Estefan to produce his next project after listening to "Mi Tierra" (1993) by his wife Gloria Estefan.
 Recording took place at Estefan's Crescent Moon Studios in Miami, Florida.
 Estefan's partner Kike Santander co-produced the recording along with Estefan and composed most of the album's tracks.
 The musical style consists of pop-boleros with ranchera influences while the lyrics reflect the theme of love.
 Four singles were released from the album: "Si Tú Supieras", "En El Jardín" (a duet with Gloria Estefan), "No Sé Olvidar", and "Yo Nací Para Amarte".
 Each of them reached number one on the "Billboard" Hot Latin Songs chart in the United States.
 A tour to promote the album was launched in the US and Latin America.
"Píntame De Colores" ("Paint Me In Colors") is a song recorded by Cuban-American singer Gloria Estefan for her fourth Spanish-language and eleventh studio album, "90 Millas".
 The song was written by Gloria Estefan and her husband, Emilio Estefan Jr. and Gaitanes (Alberto y Ricardo Gaitan) and production was credited to Estefan Jr. and Gaitanes.
 The single was released by SonyBMG on November 2007 digitally as first promotional-only single from "90 Millas" to Europe and third overall single to the United States.
"Wepa" is a song recorded by Cuban-American singer Gloria Estefan for her twelfth studio album, "Miss Little Havana".
 The song was written by Gloria Estefan and her husband, Emilio Estefan Jr. and by American producer and musician Pharrell Williams, while production was credited to Estefan Jr. and Williams.
 The single was released by Verve Forecast Records on July 24, 2011 digitally worldwide as the lead single from "Miss Little Havana".
"Partytime!"
 is a special promotional CD release by pop singer Gloria Estefan.
Gloria Estefan (born Gloria María Milagrosa Fajardo García; September 1, 1957) is a Cuban-American singer, songwriter, actress, and businesswoman.
 She started off her career as the lead singer in the group called "Miami Latin Boys" which was eventually known as Miami Sound Machine.
The Essential Gloria Estefan is the seventh compilation album released by American singer Gloria Estefan, but is the twenty-eighth album overall, released in 2006.
 It is part of Sony BMG's "The Essential" series.
"No Llores" ("Don't Cry") is a song recorded by Cuban-American singer Gloria Estefan for her fourth Spanish-language and eleventh studio album, "90 Millas".
 It features additional work with popular Latin music performers such as guitarists Carlos Santana and José Feliciano, Sheila E. playing the timbales, and Arturo Sandoval on trumpet (uncredited).
 The song was written by Gloria Estefan and her husband, Emilio Estefan Jr. and Gaitanes (Alberto y Ricardo Gaitan), while production was credited to Estefan Jr. and Gaitanes.
 The single was released by SonyBMG on June 18, 2007 digitally worldwide as the lead single from "90 Millas".
Best of Gloria Estefan is the third solo compilation album released by American singer Gloria Estefan after "Exitos" and "Gloria Estefan Greatest Hits", but is the twentieth overall, released in 1997.
 The compilation was released only in France and Switzerland.