Queen is classified as a rock band. Their earliest works were influenced by progressive rock, hard rock, and heavy metal, but the band gradually ventured into more conventional and radio-friendly works by incorporating further styles, such as arena rock and pop rock. Queens fusion of heavy metal, glam rock, and camp theatrics made it one of the most popular groups of the 1970s. Their music covers a broad spectrum, including rock, pop, blues, and soul, which has been a significant factor in their enduring appeal.