"Nevermind" was released in September 1991 and quickly became a classic, rewriting the rules of pop music for the decade that had just begun. Within a few months, the album climbed to No. 1 on the U.S. Billboard charts and also made it to the top of the charts worldwide. Young fans around the world identified with the band and made "Smells Like Teen Spirit" and its groundbreaking video their anthem. Since then, more than 30 million copies of the album have been sold.