Linkin Park released "Hybrid Theory" on October 24, 2000. It was the result of over four years of work. It was edited by Don Gilmore. "Hybrid Theory" was very successful in sales. It sold 4.8 million copies in the first year, and had the most sales of any album in 2001. The singles of the album are "One Step Closer", "Crawling", "Papercut" "In the End". It made them always appear on many alternative rock radios during 2001.