Eww eww eww. Apocalyptica ;_; I hate to admit that they're Finnish (as am I), and they play BAD cello music. The worst thing that ever has came out of this country, I tell you!
Anyways, like already mentioned, they mostly have instrumental stuff, but on their latest few albums they have some vocal guest appearances, of which sadly the latest (and which proved to be a huge megahit for the mass, but torture for other people) includes The Rasmus' and HIM's vocalists (Lauri Ylönen and Ville Valo) -.-* Horrible horrible horrible *vomits*

Oh and about Nothing Else Matters covers. There are millions of them on the Internet and everywhere, because it was such a hit song (besides Enter Sandman). And I think that women are more likely to cover that song because it's much more appealing to women than for men somehow. So good luck with the searching ;3