Her debut album, The Fame, was released on August 19, 2008. In addition to receiving generally positive reviews, it reached number one in Canada, Austria, Germany and Ireland, and topped the Billboard Top Electronic Albums chart. Its first two singles, "Just Dance" and "Poker Face", co-written and co-produced with RedOne, became international number-one hits, topping the Billboard Hot 100 in the United States as well as the charts of other countries. The album later earned a total of six Grammy Award nominations and won awards for Best Electronic/Dance Album and Best Dance Recording. In early 2009 she embarked on her first headlining tour, The Fame Ball Tour. By the fourth quarter of the year, she had released her second studio album The Fame Monster, with the global chart-topping lead single "Bad Romance", as well as having embarked on her second headlining tour of the year, The Monster Ball Tour.
Lady Gaga is inspired by glam rock musicians such as David Bowie and Freddie Mercury, as well as pop music artists such as Madonna and Michael Jackson. She has also stated fashion is a source of inspiration for her songwriting and performances. To date, she has sold over 11.5 million albums and over 40 million singles worldwide. In May 2010, Time magazine included Gaga in its annual Time 100 list of the most influential people in the world.