The second wave of Industrial was quite different from the first one – instead of a revolutionary movement, it was going-out music for the deep underground Industrial nightlife. This was the first true Industrial Dance. Electro-Industrial mixed all Industrial genres onto an electronic pounding beat, with both haunting female vocals and sinister whispering or mumbling male vocals. Sadomasochism, torture, bondage and pornography are common themes of Electro-Industrial. Deeper, darker and more layered than before, Electro-Industrial channels an aura of dominance and power. Electro-Industrial also started Industrial's common theme of "Futurism Noir" or dark sci-fi. Some artists take the ruthlessness of the music to the extreme and combine this with atonal vocals and the pulsing rhythm of EBM. This has led in the mid-90s to a subgenre called Aggrotech. Aggrotech is a bold and traumatising mixture with sharper and more abrasive sounds. Electro-Industrial is arguably one of the most extreme music genres and a prime example of Industrial's ambition to create anti-music.