The "Heavy Metal Rules" cassette is a compilation album released in 1988 featuring artists such as WASP, Megadeth, Anthrax, Great White, and Dio, among others. This first edition cassette was released by Priority Records in the United States under catalog number 4XL 9716. The album falls within the heavy metal genre of music from the 1980s era, making it a notable addition for fans of metal music from that time period.