What can I say about Apocalyptica? The obvious, four classically-trained cellists (Is that redundant? Are there any other kinds of cellists?) from Finland who use their powers for good, bringing symphonic metal to the masses. Probably best known to North American audiences for their covers on YouTube and their appearance in Some Kind of Monster, a documentary film about Metallica released in 2004, the group has been around since the early '90s. Their most recent studio album, Worlds Collide, was by far their most successful, reaching as high as 59 on the Billboard Top 200 in 2008. As one might expect, Apocalyptica produces an unusual brand of metal, at times symphonic, gothic, progressive, with an occasional track like "I'm Not Jesus" (sung by Corey Taylor of Slipknot), which can only be described as straight up rock and roll. While most metal music works better with fantasy, I feel the Apocalyptica sound lends itself well to a sci-fi rpg setting, especially space opera. This is good news for someone like me who detests techno, the usual music style associated with futuristic campaigns.
Editorial note: Apocalyptica, Crom, Sabaton, without doubt, everything interesting in heavy metal today is happening in continental Europe. The Scandinavians, Finns and Germans have taken over from the Brits and the Americans as the true powerhouses of metal.