Nirvana's second album Nevermind was released in September 1991 with low expectations, hoping to sell 500,000 copies. The album entered the Billboard 200 at number 144, but slowly climbed up the charts over the following months, entering the top 40 in November. The album was selling 300,000 copies a week by December, before in January 1992, Nevermind replaced Michael Jackson's Dangerous at number 1 on the Billboard charts.[11] The album went on to sell over 30 million copies worldwide.[12]