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After Vikernes' confinement, the Norwegian black metal scene moved to a more open and imaginative environment, and in 1995, the second wave of Norwegian black metal began. Black metal, which had once been an extremely underground phenomenon in its early days, became more well-known worldwide. The focus was no longer on death threats and burning churches, although most bands today still trend towards Satanism or are atheists. Modern lyrics still consist of themes concerning evil, Norse mythology, sex, violence and war. Most Norwegian black metal bands sign with companies in the US and England. Dimmu Borgir uses elements of classical music to expand their music to a wide range of audiences. As a result, their records show great commercial success, especially in the US. In the early days, Norwegian black metal songs were recorded on four-track tapes, but in recent times, the music has become more sophisticated. With better technology, the quality of music has become better, some critics say, and the musicians, of whom many have a background in classical music, are highly talented and well educated, though many believe black metal should stay underground, obscure and raw. What makes Norwegian black metal unique is the fact that it has "an almost inaudible echo that warns of magic and evil." Black metal bands from other countries have often tried to reproduce Norwegian black metal sounds but they have not been successful. Norwegian black metal has always had a particular sound, and as it continues to be innovative, it sells quite well around the world.