"Auld Lang Syne" (Scots pronunciation: [ˈɔːl(d) lɑŋˈsəin]: note "s" rather than "z") is a Scots poem written by Robert Burns in 1788 and set to the tune of a traditional folk song (Roud # 6294). It is well known in many countries, especially in the English-speaking world; its traditional use being to celebrate the start of the New Year at the stroke of midnight. By extension, it is also sung at funerals, graduations and as a farewell or ending to other occasions. The international Boy Scout youth movement, in many countries, uses it as a close to jamborees and other functions.

The song's Scots title may be translated into English literally as "old long since", or more idiomatically, "long long ago", "days gone by" or "old times". Consequently "For auld lang syne", as it appears in the first line of the chorus, might be loosely translated as "for (the sake of) old times".

The phrase "Auld Lang Syne" is also used in similar poems by Robert Ayton (1570–1638), Allan Ramsay (1686–1757), and James Watson (1711) as well as older folk songs predating Burns.Matthew Fitt uses the phrase "In the days of auld lang syne" as the equivalent of "Once upon a time..." in his retelling of fairy tales in the Scots language.

Mariah Carey (born March 27, 1970) is an American singer, songwriter, record producer, and actress. She made her recording debut in 1990 under the guidance of Columbia Records executive Tommy Mottola, and released her self-titled debut studio album, Mariah Carey. The album went multi-platinum and spawned four consecutive number one singles, on the U.S. Billboard Hot 100 chart. Following her marriage to Mottola in 1993, a series of hit records, including Emotions (1991), Music Box (1993) and Merry Christmas (1994), established her position as Columbia's highest-selling act. Daydream (1995), made music history when the second single, "One Sweet Day" a duet with Boyz II Men, spent a record sixteen weeks on top of the Billboard Hot 100, and remains the longest running number one song in US chart history. During the recording of the album Carey began to deviate from her pop background, and slowly traversed into R&B and Hip-hop. After her separation from Mottola, this musical change was evident with the release of Butterfly (1997).

Lea Michele Sarfati (born August 29, 1986), known professionally as Lea Michele, is an American actress and singer. Michele began working professionally as a child actress on Broadway in productions such as Ragtime and Les Misérables. She originated the role of Wendla in the musical Spring Awakening and currently plays Rachel Berry in the Fox television series Glee and made her film debut in New Year's Eve starring alongside Ashton Kutcher. Michele performs in the soprano range.

Michele was born in the Bronx, New York City. She is the only daughter of Edith, a nurse, and Marc Sarfati, a delicatessen owner. Her mother is Italian American and Roman Catholic, while her father is a Spanish Sephardic Jew. Michele was raised Catholic, and has stated that her father "gladly" attends church with her and her mother. She grew up in Tenafly, New Jersey. She attended Rockland Country Day School for elementary school in New York and then Tenafly High School. Michele was home schooled one year while working in Toronto, Ontario on Ragtime. She attended Stagedoor Manor in the Catskills, a center for performing arts training. She was then later accepted to the Tisch School of the Arts at New York University, but opted instead to continue working professionally on the stage.