EDIT: I was under the wrong Impression. As pointed out by true happiness, the girls did not resing them, they just chose them. I have reworded the post so it is correct.
The girls of "Girls' Generation" has made a j-pop compilation album - featuring their favorite jpop songs. Among these included are Ayumi Hamasaki, Koda Kumi, BoA, Namie Amuro, YUI, Mika Nakashima, AAA, Tohoshinki. m-flo, Do as Infinity, ELT, Yuna Ito, hiro, Toki Asako, Hiroshi Tamaki, mink, Chemistry and Jonte.
Yoona of Girls' Generation chose "Boys & Girls" and another song by Hiroshi Tamaki.
The collection comes in a two disc set - 9 tracks each - one song picked by each girl on each disc (totaling two songs per girl)
source:
http://us.yesasia.com/en/PrdDept.asp...id-1010654600/