A fifth and final single, "Let's Get Loud" did not chart on the Hot 100 due to the lack of a physical release in the US, but became a major hit in several other countries.

Since her childhood, Lopez's Puerto Rican parents stressed the importance of a good work ethic and the ability to speak English.

[6] During her final year of high school, Lopez learned about a casting call for several teenage girls for small film roles.

She moved to Los Angeles with then-boyfriend David Cruz to film the series, and remained a cast member until 1993 (when she decided to pursue a full-time acting career).

He played piano and sang "Talk About Us" for them, which Mottola and Lopez liked; she recorded it the next day, and worked closely with Rooney on the rest of the album.

[15] Other contributors to On the 6 included then-boyfriend Sean "Puffy" Combs, future husband Marc Anthony, Rodney "Darkchild" Jerkins, Poke & Tone and the husband-and-wife team of Emilio and Gloria Estefan.

[16] Grammy Award-winning singer and vocal producer Betty Wright, known for her hit "Clean Up Woman" (1971), worked closely with Lopez on the album and provided her with "plenty of inspiration".

[19] Lopez felt that recording her first album was "worlds apart" from being a film actress in Hollywood: "The movie business is so structured with time frames and such.

[2][27] "Let's Get Loud" is a "fiery, soulful"[2] salsa dance song originally written for Gloria Estefan, who gave it to Lopez (who, she felt, would have more fun with it).

[28] "Feelin' So Good", a mid-tempo hip-hop song featuring Big Pun and Fat Joe, samples Strafe's "Set It Off".

Produced by Rodney Jerkins, LaShawn Daniels, Fred Jenkins III and Cory Rooney, the single was an instant hit (reaching number one in the United States).

The album's title refers to the 6 subway service in New York City, which Lopez used to ride to and from work in Manhattan as well as her home in the Bronx during her early career.

[60] On the day of the album's release, Lopez appeared at the Virgin Megastore in New York City and signed copies of the CD for fans.

[61] On July 9, Lopez and Ricky Martin appeared on The Oprah Winfrey Show to discuss the "Latin explosion" in the Anglo music market.

[67] That October MTV aired a documentary about the entertainer, which retraced her "steps into the spotlight as one of show business's hottest stars" by returning "to her pre-headline days during her childhood in the Bronx, where her dream to perform was first ignited at age five as a ballet and flamenco student".

[68] On December 8, 1999, Lopez first performed "Waiting for Tonight" at the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas, where she opened the show.

[69] On December 27, 1999, Lopez and then-boyfriend, rapper and producer Sean Combs (who co-produced On the 6), were arrested with two others in connection with a shooting outside the Times Square Club in New York.

With the release of "Feelin' So Good" as a single, Lopez dove back into another sea of promotion with several TV interviews at the beginning of 2000.

[82] Elysa Gardner of the Los Angeles Times gave the album a positive review, praising its blend of "urban and Latin textures and grooves with shiny pop savvy" and Lopez' vocals, which she described "as seductively emotive as her work on screen".

[37] NME noted, "Millionaire movie star Jennifer Lopez sidles into the music biz and her sultry purr singlehandedly eradicates all public need for the likes of (Whitney) Houston, (Celine) Dion and the rest of the world's favourite shag-anthem divas...Mariah Carey's ongoing quest for cool has just been dealt a severe blow.

"[80] Rolling Stone's Rob Sheffield gave the album three out of five stars, complimenting Lopez's conservative attitude to her music: "The happy surprise of On the 6 is that she knows what she's doing.

Instead of strained vocal pyrotechnics, Lopez sticks to the understated R&B murmur of a round-the-way superstar who doesn't need to belt because she knows you're already paying attention."

[104] By October 2010 Billboard's Gary Trust reported that the album had sold 2.81 million copies in the United States, making it Lopez's second-bestseller overall.

It spent a total of 38 weeks on the chart, and was awarded a double-gold certification by the Syndicat National de l'Édition Phonographique for sales of 210,000 copies.

[127] Brian Haack of The Recording Academy wrote that it was Lopez's performance in Selena that positioned her as "the breakout female star to help propel the Latin pop movement".

[134] The provocative music video for the album's lead single ("If You Had My Love") was a hit on MTV channels worldwide, with Lopez popular in a field previously dominated by Madonna and Janet Jackson.

[136] In 2013, Andrew Barker of Variety described the single as her "breakout club hit", observing that it "seemed to anticipate the rise of Euro-centric dance pop a decade before EDM became a buzz term" and noting that when DJ culture became a trend Lopez turned away (instead released the Spanish-language Como Ama una Mujer in 2007).

[137] Since the release of On the 6, Lopez has been widely regarded as a triple-threat performer: the most-influential entertainer of Hispanic descent in the United States and a pop culture icon.

[138][139] The Los Angeles Times wrote, "Making the transition from hot actor to singing star is a risky proposition—anyone remember Philip Michael Thomas' musical moment?

In April 2011 CNN wrote, "From Fly Girl on In Living Color to judge on American Idol, she has taken her talent beyond the triple threat of being a dancer, singer and actress and now helms an empire that includes fragrances, a production company, lucrative endorsements and a place once again atop the charts, having sold tens of millions of records over the years".