Hetfield replied, "My name isn't on those records. And I'm not out trying to sell them", and raised questions such as, "Where would it end? Does he start touring with it? Does he sell shirts? Is it his band?" In April 2001, filmmakers Joe Berlinger and Bruce Sinofsky began following Metallica to document the recording process of the band's next studio album. Over two years they recorded more than 1,000 hours of footage. On July 19, 2001, before preparations to enter the recording studio, Hetfield entered rehab to treat his "alcoholism and other addictions". All recording plans were put on hold and the band's future was in doubt. Hetfield left rehab on December 4, 2001, and the band returned to the recording studio on April 12, 2002. Hetfield was required to limit his work to four hours a day between noon and 4 pm, and to spend the rest of his time with his family. The footage recorded by Berlinger and Sinofsky was compiled into the documentary "", which premiered at the Sundance Film Festival in January 2004. In the documentary, Newsted said his former bandmates' decision to hire a therapist to help solve their problems which he felt they could have solved on their own was "really fucking lame and weak". In June 2003, Metallica's eighth studio album, "St. Anger", debuted at number one on the "Billboard" 200, and drew mixed reactions from critics. Ulrich's "steely" sounding snare drum and the absence of guitar solos received particular criticism. Kevin Forest Moreau of "Shakingthrough.net" said, "the guitars stumble in a monotone of mid-level, processed rattle; the drums don't propel as much as struggle to disguise an all-too-turgid pace; and the rage is both unfocused and leavened with too much narcissistic navel-gazing". Brent DiCrescenzo of "Pitchfork" described it as "an utter mess". However, "Blender" magazine called it the "grimiest and grimmest of the band's Bob Rock productions", and "New York Magazine" called it "utterly raw and rocking". The title track, "St. Anger", won the Grammy Award for Best Metal Performance in 2004; it was used as the official theme song for WWE's "SummerSlam 2003". For the duration of "St. Anger"s recording period, producer Bob Rock played bass on the album and in several live shows at which Metallica performed during that time.