49. On the Floor by Jennifer Lopez

Lopez was born on July 24, 1969 in the Castle Hill neighborhood of The Bronx, New York. The middle child of Puerto Rican parents Guadalupe Rodriguez and David Lopez, she has an elder sister, Leslie, and a younger sister, Lynda (born June 14, 1971).David worked the night shift at the Guardian Insurance Company, before becoming a computer technician at the firm, while Guadalupe was a homemaker. When Jennifer was born, the Lopez family was living in a small apartment. A few years later, her parents had saved up enough money to be able to purchase a two-story house, which was considered a big deal for the relatively poor family. By the age of five, Lopez began taking singing and dancing lessons. She toured New York with her school when she was seven years old.
Lopez's debut album On the 6 was released on June 1, 1999 in the United States. It achieved commercial success, peaking inside the top ten of the Billboard 200. It was proceeded by the May release of her debut single "If You Had My Love". The song was a success worldwide, and became her first number one on the Billboard Hot 100. A ballad with fellow Latin singer Marc Anthony entitled "No Me Ames" was released as a B-side to "If You Had My Love" and the album's second single. The song was promoted by Sony Discos, who released a salsa and a ballad version of the song on their respective radio formats. Dance track "Waiting for Tonight" served as the album's third single. It became her second top-ten single on the Hot 100, and became an anthem for the new millennium. Two further singles were released in from the album. The fourth was "Feelin' So Good" and fifth was "Let's Get Loud", each attained moderate success. "Waiting for Tonight" (2000) and "Let's Get Loud" (2001) each received Grammy Award nominations in the Best Dance Recording category
Lopez released her first single with Island Records, "On the Floor", featuring Pitbull. The song topped the charts across the globe; peaking at number three on the Billboard Hot 100, her highest peaking song on that chart in over eight years. The song became one of the most successful singles of the year. Love? was finally released on May 3, 2011 in the United States