Junichi Suwabe has one of the best voices in anime ever! He does an excellent job of channeling Grimmjow into these songs..., if you can even imagine Grimmjow deciding to take up recording a couple of tracks, I could see them sounding like this, the lyrics are certainly fitting (you can find translations online). The "voice message" is also great where Junichi starts and ends it in "Grimmjow-mode", but speaks in a normal voice about the recording of the songs (in Japanese, of course, I also found an online translation of it as well). It's an excellent buy for any Bleach/Grimmjow fan. Well worth it!