Tsubasa wo Kudasai is a song commonly sung by elementary school kids in Japan. It's been in a ton of anime. It was even used in an episode of Momoclo chan earlier this summer.
"Tsubasa wo Kudasai" has been around for a long time. It's also used in junior high school as a chorus contest song. K-ON! anime did a version of it as well.
Whoa thank you sooo much for all the links provided :D They're all gotten really good now :) Kanako's vibrato is great but I think control is still a bit off... they used to sing while dancing so I think it's still a bit difficult to sing like this especially on ccoustic. ...and maybe because she's nervous XD looking forward for the next episode :x
November 27 Fuji TV NEXT Sakazaki Kounosuke no Momoiro Folk Mura #3(19:00~21:00)
December 27 Fuji TV NEXT GIRLS' FACTORY 14 DAY2(9:00~13:00) Sakazaki Kounosuke no Momoiro Folk Mura #1(13:00~15:00) Sakazaki Kounosuke no Momoiro Folk Mura #2(15:00~17:00) Sakazaki Kounosuke no Momoiro Folk Mura #3(17:00~19:00) Sakazaki Kounosuke no Momoiro Christmas(19:00~22:00)