Hybrid Theory is the debut album by the American rock band Linkin Park, released on October 24th, 2000 through Warner Bros. Records. The album was a huge commercial success, selling over 10 million units in the United States alone and peaking at number two on the Billboard 200 while also reaching high positions on other charts worldwide, despite receiving mixed reviews from publications. It has also sold 24 million copies worldwide as of 2009, including over 10 million in the U.S. which makes it the band's best-selling album, the second best-selling album of the 21st century so far, and the second best selling debut album. It is also one of the few albums to be certified Diamond in the U.S. that was released in this century. Recorded at NRG Recordings in North Hollywood, California, and produced by Don Gilmore, the album's lyrical themes deal with problems lead vocalist Chester Bennington experienced during his adolescence, including drug abuse and the constant fighting and divorce of his parents. Hybrid Theory takes its title from the previous name of the band. Four singles were released from the album: "One Step Closer", "Papercut", "In the End", and the Grammy Award-winning "Crawling", which along with "In the End" was responsible for launching Linkin Park into mainstream popularity. At the 2002 Grammy Awards, Hybrid Theory was nominated for Best Rock Album. Hybrid Theory was released in the United States on October 24th, 2000 following the debut of "One Step Closer" o