Hybrid Theory is the debut album by the American nu metal band Linkin Park. Released on October 24, 2000 through Warner Bros. Records, the album was a huge commercial success selling over 24 million units worldwide, peaking at #2 in the U.S. Billboard 200 and reaching high positions in charts worldwide, despite receiving mixed reviews from publications. 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.   Wikipedia