I have been working on this series for months!
Here is the first part in a compilation of additional artists who have done background vocals for SNSD's discography.

Vocalists (in order):
Sugar Flow
Yvla Dimberg
Hong Ji Yu
Kim Hyo Soo
Kim HyeonA
Lola Fair
Engelina Larsen
Katy Tiz
Choi Young Kyung
Chikk, Brittany Burton Lee Ju Hyung
Orion
Agnes Shin


CHAPTERS:
0:00 Gee, Forever 1
0:20 Run Devil Run
0:44 Kissing You, Complete, Dear Mom
1:20 Genie, Tears
1:50 Say Yes, Check
2:17 I Got a Boy, Promise, Romantic St
2:57 Goodbye
3:10 Green Light
3:27 You-aholic, The Great Escape
4:12 Party
4:34 Lion Heart