Death metal is a style of heavy metal that is a very fast, brutal and energetic. It has very harsh singing. Most death metal has very fast guitar and drum beats. Almost every death metal drummer plays with two bass drums (or a type of pedal that has two beaters on one bass drum), so that they can play the bass drum beats faster. It is a music focused mainly on drums and guitars. The lyrics in death metal sometimes involve topics such as death, war and pain. Some bands choose to write about philosophy or religion. Some bands try to write about things that other death metal bands do not write about such as ancient history. Death metal vocalists usually grunt, growl or scream.