One of my favorite shows of the current season is K-On.
The two songs (OP and ED) are sung by the seiyuu, and they are
very catchy.  I prefer the OP, but the ED is selling better.
Both the OP and ED are in the Oricon top 10 daily charts.

Cagayake! Girls
PCCG-70036
released 2009.04.22
1260 yen

This CD contains the opening song to the TV anime K-On (けいおん！).

The tracks are as follows.

   1. Cagayake! GIRLS
   2. Happy!? Sorry!!
   3. Cagayake! GIRLS (Instrumental)
   4. Happy!? Sorry!! (Instrumental) 

Songs by the Sakura Kou Keionbu (桜高軽音部)
[Hirasawa Yui, Akiyama Mio, Tainaka Ritsu, Kotobuki Tsumugi],
voice by Toyosaki Aki (豊崎愛生), Hikasa Youko (日笠陽子),
Satou Satomi (佐藤聡美), Kotobuki Minako (寿美菜子).
Main vocal by Toyosaki Aki.

The first press of this CD package contains individual CD
jackets of the girls. 

Web page at

http://www.usagi.org/doi/seiyuu/cd/toyosaki/cagayake-girls.html

--
Hitoshi Doi
                         " this space for rent "
http://www.usagi.org/doi/                                    doi@usagi.org