"Adia" is a song by Sarah McLachlan that originally appeared on her 1997 album Surfacing. It was co-written by McLachlan and her longtime producer, Pierre Marchand. The song allegedly reflected the apology to her best friend for becoming involved with, and later marrying, her friend's ex-boyfriend. On VH1 Storytellers, McLachlan also said "I'm not quite sure how to explain this one but, uh, I guess more than anything it's about my problems in dealing with feeling responsible for everyone else" about this song.

"Adia" was McLachlan's first top 5 song on the Billboard Hot 100 chart, peaked at number three. Though it only remained at the position for one week, the song did spent six consecutive weeks at number four and seven consecutive weeks at number five, totalling twenty-three weeks at the top ten and forty-nine weeks at the chart, "Adia" was the twentieth most successful song of 1998 in the US.

"Adia" was the third of four songs from Surfacing to be released as a single. It was her most successful US single, peaking at number three on the Billboard Hot 100. The single, released July 7, 1998, contains four tracks: the radio mix of "Adia", the Surfacing mix of "Angel", the original studio version of "I Will Remember You" (as opposed to the live version included on the Mirrorball album, also released as a single), and a live version of "Building a Mystery". McLachlan was nominated for Best Female Pop Vocal Performance at the Grammy Awards of 1999 for "Adia", losing to Celine Dion's "My Heart Will Go On".

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."

Avril Ramona Lavigne (pronunciation: /ˈævrɨl ləˈviːn/; AV-ril lə-VEEN; born 27 September 1984) is a Canadian singer-songwriter. She was born in Belleville, Ontario, but spent most of her youth in the small town of Napanee. By the age of 15, she had appeared on stage with Shania Twain; by 16, she had signed a two-album recording contract with Arista Records worth more than $2 million. In 2002, when she was 17 years old, Lavigne broke onto the music scene with her debut album Let Go.

Let Go made Lavigne the youngest female soloist to reach No. 1 in the UK, and the album was certified four-times platinum by the Recording Industry Association of America. By 2009, over 16 million copies had been sold worldwide. Her breakthrough single, "Complicated", peaked at No. 1 in many countries around the world, as did the album Let Go. Her second album, Under My Skin, was released in 2004 and was her first album to peak at No. 1 on the U.S. Billboard 200, eventually selling more than 10 million copies worldwide. The Best Damn Thing, Lavigne’s third album, was released in 2007, becoming her third No. 1 album in the UK Albums Chart and featuring her first U.S. Billboard Hot 100 No. 1 single, "Girlfriend". Lavigne has scored six number-one singles worldwide, including "Complicated", "Sk8er Boi", "I'm with You", "My Happy Ending", "Nobody's Home", and "Girlfriend". With more than 30 million copies of her albums sold worldwide, Lavigne is one of the top-selling artists releasing albums in the U.S., with over 10.25 million copies certified by the RIAA. Her fourth studio album, Goodbye Lullaby, was released in March 2011. Goodbye Lullaby gave Lavigne her fourth top 10 album on the U.S. Billboard 200 and the UK Albums Chart and her third No. 1 album in both Japan and Australia. Three months after the release of Goodbye Lullaby, Lavigne began work on her fifth album, which will be released on Epic Records following her departure from RCA Records.