CD box set release from anime series "K-ON! (Keion!)" featuring its intro, outro themes, insert songs, character songs, and BGMs for over 200 tracks total. Also includes 19 songs from PSP game "K-ON! Hokago Live!!" which are released on CD for the first time (subject to change). Set consists of 12 discs, a description booklet, and an illustration booklet. Features newly illustrated cover artwork. Not includes instrumental tracks, "Radion!" (web radio), Live CD, "Band Yaro yo!" series.