The 300 page book All Known Metal Bands is a simple listing of every heavy metal band name that exists or has ever existed, in every genre, that I could find, in what turned out to be a year and a half of research. Where a name was used by more than one band, the name is listed once for each band. The pages are black, the type is silver, and it will make you want to do naughty things. Of the 51,000 bands listed, the most commonly used name is Legion. There are 24 bands named Legion. There are 20 bands named Genocide, and 20 called Requiem. There are 2 called Cryptic Stench, but there is only one Black Darkness.