Given to those who pre-ordered the game in the US.  This disc is identical to Disc 1 of the Japanese soundtrack release. Although, the OST contains no individual composer credits, the following composer credits have been provided by:

Atelier Iris ETERNAL MANA Arranged Tracks DECEITFUL WINGS
Atelier Series Vocal Collection ~ Volkslied
Atelier Series & Mana-Khemia Vocal Collection VOLKSLIED 2
Atelier Iris Eternal Mana Soundtrack Diary (http://shop.salburg.com/product/irisCD/diary.html)

Composed by:
Akira Tsuchiya (Disc 1: 1, 2, 5, 39)
Daisuke Achiwa (Disc 1: 4,  8,  37)
Ken Nakagawa (Disc 1: 6, 7, 12, 25, 28, 38)

All other tracks composed by either Daisuke Achiwa or Ken Nakagawa (Tsuchiya states in the Soundtrack Diary that he only composed "Midnight Illusion", "A Genesis" and "IRIS")

DISC 1: 1 & 39
Lyrics/Composer : Akira Tsuchiya
Arranger : Akira Tsuchiya/Takashige Inagaki
Vocal: Haruka Shimotsuki

DISC 1: 38
Lyrics/Composer/Arranger : Ken Nakagawa
Vocal : Mami Horie