"Sway" is the English version of "¿Quién será?", a 1953 mambo song by Mexican composer and bandleader Pablo Beltrán Ruiz. The most famous version is that of Dean Martin recorded in 1954. English lyrics are by Norman Gimbel. Since then the song has been recorded and remixed by many artists (see discography below).

"¿Quién será?" is a Spanish song written and recorded by Pablo Beltrán Ruiz.

In 1954 the English lyrics were written by Norman Gimbel and recorded by Dean Martin (his recording reached number fifteen on the Billboard magazine best-seller chart and number six on the UK chart).

"Sway" was released as the fourth and final single from Michael Bublé's self-titled debut album in 2004. The physical single was released on July 22, 2004. The song has been used in Las Vegas, CSI: NY, Malcolm in the Middle, The Wedding Date and No Reservations. In many other countries, "Sway" was released as a double A-side with "Spiderman Theme", which was the album's third single. "Sway" was only released as a separate single in Australia.

Julio Iglesias (born Julio José Iglesias de la Cueva; September 23, 1943) is a Spanish singer and songwriter whose romantic image, magnetic stage presence, and expressive music made him one of the best-selling artists of all time. By the early 21st century he had sold hundreds of millions of albums in more than a dozen languages. He has sold over 300 million records worldwide in 14 languages and released 77 albums. According to Sony Music Entertainment, he is one of the top 15 best-selling music artists in history. While Iglesias rose to international prominence in the 1970s and 1980s as a performer of romantic ballads, his success has continued on as he entered new musical endeavors. He is the father of singer Enrique Iglesias.

Iglesias was born in Madrid, the eldest son of Dr. Julio Iglesias Puga and María del Rosario de la Cueva y Perignat. Iglesias' father's family was from Galicia, and Iglesias' mother an Andalusian.

In the 1960s, he studied law in Madrid and was a goalkeeper for one of Real Madrid's football teams. On September 22, 1963, he was involved in a car crash, resulting in an injury to his spinal cord. He said, "I had a car accident; [a] very, very strange car accident...I lost control of the car and rolled it, resulting in what they call 'paraparexia,' which is not paraplegia. It's a compression in the [spinal] cord, in the sense of the neck...my spinal cord; and I was very, very ill for three years."  His doctors thought he would never walk again; indeed, his legs were left permanently weakened, and they continued to require therapy as of late October 2010. However, slowly, he began recovering his health. To develop and increase the dexterity of his hands, he began playing guitar. When he recovered from his accident, he resumed academic studies and traveled to the United Kingdom to study the English language, first in Ramsgate, then at Bell Educational Trust's Language School in Cambridge.

Jennifer Lynn Lopez (born July 24, 1969) is an American actress, businesswoman, dancer and recording artist. Often referred to as J.Lo, she is reportedly the highest earning actress of Latin descent. Born and raised in The Bronx, New York, she enrolled in singing and dancing classes as a child and grew up in a musically influenced household. She started her career as a fly girl on the television comedy program In Living Color and a back-up dancer for Janet Jackson. Lopez gained recognition in the action-thriller Money Train (1995). Her first leading role was in the biographical film Selena (1997), which was her breakthrough role, earning her an ALMA Award for Outstanding Actress and Golden Globe nomination. She earned her second ALMA Award for her performance in Out of Sight (1998), which made her the highest-paid Latin actress. She has since appeared in various films including The Cell (2000), The Wedding Planner (2001), Maid in Manhattan (2002), Shall We Dance? (2004), Monster-in-Law (2005), The Back-up Plan (2010) and What to Expect When You're Expecting (2012).