"A Song is Born" question

[leafyamazaki]

the [tv-version] is indeed the instrumental version...

on the single, the [original mix] is the duet by ayu and keiko-san.

there r 5 versions of the [a song is born], namely:

a song is born [original mix] *single + song+nation album
a song is born [tv-mix] *single
A Song is born *I am... album
a song is born [tatsumaki remix] *from songnation 2 trance
a song is born [globe version] *from songnation 2 trance