"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. Read more on Last.fm.