"Children of the Light" is a different mix of the Keys to Ascension 2 track. Specifically, the Keystudio version contains an extended keyboard introduction by Rick Wakeman entitled "Lightning". This mix omits the opening lyrics found on the Keys to Ascension 2 version.
Prior to this album's release, it was reported that it would have a track called "The Second Time Around". This would have been a version of "Sign Language" that incorporated Jon Anderson's vocals. However, the track was not included on this disc.
After 2010, the CD became out of print, with very limited availability. After its unavailability, a replacement release was made containing everything from Keys, titled "Keys to Ascension Complete".