Japan-only compilation consists of two discs, one with the Blu-spec CD2 version of this release and the other one with the standard CD version, so that you can compare the sounds. *Blu-spec CD2 is the next generation Compact Disc that employs the Phase Transition Mastering, the technology developed for mastering of Blu-ray discs, to further perfect the acclaimed characteristics of Blu-spec CD. Fully compatible with standard CD players, Blu-spec CD2 completely alters the experience of music.