It is a category to put copyright free BGM music material of genre of heavy metal. Like hard rock, heavy metal is said to emphasize the distorted sound of electric guitar in its basic form, and it is said that it was born in punk movement when hard rock reached its limit point, but it is clear with hard rock There is no distinction. In this genre, bands featuring fast guitar playing, vocal shouts, and fast tempo music are the mainstream. Main bands include Black Sabbath, Iron Maiden, Metallica, etc. If you are looking for free metal on heavy metal, you can find it here.