Sleeve M; Vinyl M. Hybrid Theory is the debut studio album by American rock band Linkin Park, released on October 24, 2000. The album is renowned for its innovative fusion of nu-metal, rap, and electronic elements, featuring standout tracks like "In the End," "Crawling," and "One Step Closer." Hybrid Theory has sold over 27 million copies worldwide, making it one of the best-selling debut albums of the 21st century.