Sarah Ann McLachlan, OC, OBC (born January 28, 1968) is a Canadian musician, singer and songwriter. Known for her emotional ballads and mezzo-soprano vocal range, as of 2009, she has sold over 40 million albums worldwide. McLachlan's best-selling album to date is Surfacing, for which she won two Grammy Awards (out of four nominations) and four Juno Awards. In addition to her personal artistic efforts, she founded the Lilith Fair tour, which showcased female musicians. The Lilith Fair concert tours took place from 1997 to 1999, and resumed in the summer of 2010. Since 2006 she has also been known as a highly visible supporter of the ASPCA, as well as various other charities.

Sarah McLachlan was born on January 28, 1968, and adopted in Halifax, Nova Scotia, Canada. As a child, she took voice lessons, along with studies in classical piano and guitar. When she was 17 years old and still a student at Queen Elizabeth High School, she fronted a short-lived rock band called The October Game. One of the band's songs, "Grind", credited as a group composition, can be found on the independent Flamingo Records release Out of the Fog and the CD Out of the Fog Too. It has yet to be released elsewhere. Her high school yearbook predicted that she was "destined to become a famous rock star."

Ann "Annie" Lennox, OBE (born 25 December 1954), is a Scottish singer-songwriter, political activist and philanthropist. After achieving minor success in the late 1970s as part of the New Wave band The Tourists, she and fellow musician David A. Stewart went on to achieve major international success in the 1980s as Eurythmics. Lennox is the most recognized female artist at the Brit Awards, winning a total of eight awards. She has also been named the "Brits Champion of Champions".

Lennox embarked on a solo career in the 1990s with her debut album, Diva (1992), which produced several hit singles including "Why" and "Walking on Broken Glass". To date, she has released five solo studio albums and a compilation album, The Annie Lennox Collection (2009). She is the recipient of eight Brit Awards, four Grammy Awards and an MTV Video Music Award. In 2002, Lennox received a Billboard Century Award; the highest accolade from Billboard Magazine. In 2004, she won both the Golden Globe and the Academy Award for Best Original Song for "Into the West", written for the soundtrack to the feature film The Lord of the Rings: The Return of the King.

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).