Invincible is Michael Jackson's 10th solo studio album, released Oct. 20, 2001, and was also the last studio album released during his lifetime. This album was not as successful as Jackson hoped it would be, and some people (including Jackson himself) blamed Sony for not properly promoting the album. The album ultimately took four years to make, do to Jackson's many other projects and financial problems, and it was the least successful his albums. The album reportedly sold over 13 million units worldwide.