"[5] "Follow the Nightingale" is an upbeat song influenced by dark wave neoclassical music, with two major movements.

The first movement (occurring three times, 0:00-0:40, 1:19-1:50 and 2:17-3:23) are quiet, featuring light chorus work by Kokia, the harp, stringed instruments and the piano.

The second movement (0:40-1:19, 1:50-2:17 and 3:57-4:36) begins with the sound of maracas and Kokia's voice amplified several times with layered chorus work.

[8] "Say Goodbye & Good Day," in comparison, is a pop song, arranged with a standard band backing (bass, guitar, drums) and piano, with without complex chorus work.

On her decision to use the word "goodbye" (despite its sad implications), she notes she chose it to give the feeling of "advancing to the next step.

[16] Because of this, "Follow the Nightingale" is Kokia's fourth best selling single, after "The Power of Smile/Remember the Kiss," "Kawaranai Koto (Since 1976)" and "Ai no Melody/Chōwa Oto (With Reflection)".