Lady Gaga is inspired by glam rock artists such as David Bowie and Queen, as well as pop singers such as Madonna and Michael Jackson. She has also stated fashion is a source of inspiration for her songwriting and performances. Gaga was ranked the 73rd Artist of the 2000-10 decade by Billboard.As of August 2010, Gaga has sold more than 15 million albums and 51 million singles worldwide. In May 2010, Time magazine included Gaga in its annual Time 100 list of the most influential people in the world. In June 2010, Forbes listed Gaga fourth on its list of the 100 Most Powerful and Influential celebrities in the world; she is also ranked as the second most powerful musician in the world. In October 2010, Forbes placed Gaga at number seven on their annual list of the World's 100 Most Powerful Women.