Metallica is an American heavy metal band active from the 1980s to the 2000s. After building a loyal following through its role in the development of thrash metal in the 1980s, Metallica successfully broadened its audience in the early 1990s. Accordingly, the band stood as the most commercially visible example of the metal genre for most of that decade. However, Metallica's vastly increased commercial success was accompanied by stylistic changes that fostered accusations of "selling out" by some long-time fans. In 2003 Metallica released St. Anger, a collection of the most aggressive music they'd written in a decade, to deeply divided critical reviews and comparatively mediocre sales figures. Nevertheless, extensive and successful tours throughout 2003 and 2004 reinforced the band's reputation as a top-notch live act.