Over the late 90s and early 00s, power metal spread over Europe especially as well as the rest of the world, often incorporating new influences. Italy's Elvenking, Sweden's Falconer, Spain's Mägo de Oz, and Denmark's Wuthering Heights integrated elements of folk music with power metal. Angra, Kamelot, and especially Symphony X are known for combining progressive and power metal. Some bands are known for combining power metal with more aggressive musical forms; Children of Bodom were one of the earliest who combined elements of power metal and an early form of melodic death metal.