In September 1991, Nirvana released its major label debut, "Nevermind". The album was at best hoped to be a minor success on par with Sonic Youth's "Goo", which Geffen had released a year earlier. It was the release of the album's first single "Smells Like Teen Spirit" that "marked the instigation of the grunge music phenomenon". Due to constant airplay of the song's music video on MTV, "Nevermind" was selling 400,000 copies a week by Christmas 1991, and was certified gold on November 27, 1991. In January 1992, "Nevermind" replaced pop superstar Michael Jackson's "Dangerous" at number one on the "Billboard" 200. "Nevermind" was certified diamond by the RIAA in 1999.