Tool is a band whose music is pretty hard to label. They've been called everything from metal, to numetal, to alternative and progressive rock/metal. While they exhibit attributes to all of the aforementioned genres, it's pretty safe to say that they've created a kind of music that's timeless, transcendent, deep, mysterious, forbidding and intriguing - all at once. To me, their name sums up the music they make perfectly - a "tool" for exploring the mysterious depths of the human psyche. The music usually explores darker themes like pain, anger, frustration and guilt, then regurgitates them into a volatile, yet beautiful and alluring catharsis.