I haven't heard that much of Apocalyptica. The only thing that I heard was their Metallica covers, and I'm pretty sure I heard a few Iron Maiden covers (The Trooper, maybe?). They're great musicians. I can't say that they have great taste in music, considering that they did an entire Metallica cover album, but at least their covers were better than the original songs. I heard that they started to do original songs, but I just don't care enough about cellos to actually take the time to listen to any original material. I'm sure it's good, considering that their covers were good.