[2] During an interview with songwriter and record producer Emanuel Kiriakou, Lovato said: "Nightingale is definitely a personal song.
[3][4] On May 9, 2013, in a track-by-track Billboard review, magazine music journalist Jason Lipshutz stated: "This is the type of ballad that Lovato makes look like a lay-up: the theatrical notes are in place, but so is the patience, maturity and attitude that establish the singer from her pop peers.
[5] On December 24, 2014, Lovato released a music video on Vevo, shot in black and white, as an early Christmas present for her fans.
[6] The video features a cameo appearance from American actor Wilmer Valderrama with whom she shares a kiss.
[9] Lovato performed the song live on Good Morning America on June 6, 2014, as a part of her Summer Concert Series.