In music, a song is a composition for voice or voices, performed by singing. A song may be accompanied by musical instruments, or it may be unaccompanied, as in the case of a cappella songs. The lyrics (words) of songs are typically of a poetic, rhyming nature, though they may be religious verses or free prose.

A song may be for a solo singer, a duet, trio, or larger ensemble involving more voices. Songs with more than one voice to a part are considered choral works. Songs can be broadly divided into many different forms, depending on the criteria used. One division is between "art songs", "pop songs", and "folk songs". Other common methods of classification are by purpose (sacred vs secular), by style (dance, ballad, Lied, etc.), or by time of origin (Renaissance, Contemporary, etc.).

A song is a piece of music for accompanied or unaccompanied voice or voices or, "the act or art of singing," but the term is generally not used for large vocal forms including opera and oratorio. However, the term is, "often found in various figurative and transferred sense (e.g. for the lyrical second subject of a sonata...)." The noun "song" has the same etymological root as the verb "to sing" and the Oxford English Dictionary (OED) defines the word to mean "that which is sung" or "a musical composition suggestive of song." The OED also defines the word to mean "a poem" or "the musical phrases uttered by some birds, whales, and insects, typically forming a recognizable and repeated sequence and used chiefly for territorial defence or for attracting mates."

Enrique Iglesias (born Enrique Miguel Iglesias Preysler; May 8, 1975) is a Spanish singer, songwriter and occasional actor, popular in both the Latin market and the Hispanic American market in the United States. He is the son of the famous Spanish singer Julio Iglesias. Within five years of beginning his musical career in the 1990s, he became the biggest seller of Spanish-language albums of that decade. He made his crossover into the mainstream English language market before the turn of the millennium, signing a multi-album deal with Universal Music Group for an unprecedented US$50,000,000 with Universal Music Latino to release his Spanish albums and Interscope to release English albums. In 2010, he parted with Interscope and signed with another Universal Music Group label, Universal Republic.

Iglesias has sold over 100 million records worldwide, making him one of the best selling Spanish language artists of all time. He has had five Billboard Hot 100 top five singles, including two number-ones, and holds the record for producing 22 number-one Spanish-language singles on the Billboard's Hot Latin Tracks. He has also had ten number-one songs on Billboard's Dance charts, more than any other single male artist. Altogether, Iglesias has amassed 55 number-one hits on the various Billboard charts. Billboard has called him The King of Latin Pop and The King of Dance. Billboard also named Enrique the number two Latin artist of the years 1986–2011 (Luis Miguel taking the first spot).

Whitney Elizabeth Houston (August 9, 1963 – February 11, 2012) was an American recording artist, actress, producer, and model. In 2009, the Guinness World Records cited her as the most-awarded female act of all-time. Houston was one of the world's best-selling music artists, having sold over 170 million albums, singles and videos worldwide. She released seven studio albums and three movie soundtrack albums, all of which have diamond, multi-platinum, platinum or gold certification. Houston's crossover appeal on the popular music charts, as well as her prominence on MTV, starting with her video for "How Will I Know", influenced several African American female artists to follow in her footsteps.

Houston is the only artist to chart seven consecutive No. 1 Billboard Hot 100 hits. She is the second artist behind Elton John and the only female artist to have two number-one Billboard 200 Album awards (formerly "Top Pop Album") on the Billboard magazine year-end charts. Houston's 1985 debut album Whitney Houston became the best-selling debut album by a female act at the time of its release. The album was named Rolling Stone's best album of 1986, and was ranked at number 254 on Rolling Stone's list of the 500 Greatest Albums of All Time. Her second studio album Whitney (1987) became the first album by a female artist to debut at number one on the Billboard 200 albums chart.