WeAreInFlames I think you have to be goddamn retarded to not take in vocals to add style in music at all. You fucking retard. It has consideration. Are you going to say a vocal-only band isn't music now or something? What the fuck is wrong with you?
Is Blood Tsunami a black metal band?
As for a capella music, there the "vocals" work as instruments - instead of delivering lyrics they work at a specific pitch. They're genuinely musical. Rock and metal singing is not really musical for the most part in that they don't usually sing a certain pitch, but rather just sing, although they frequently follow along loosely. The comparison between rock vocals and a capella is not really valid.