Megadeth is an American heavy metal band formed in 1983 by guitarist Dave Mustaine and bassist David Ellefson in Los Angeles, California. Along with Metallica, Anthrax, and Slayer, Megadeth is one of the "big four" of American thrash metal, responsible for its development and popularization. Their music features complex arrangements and fast rhythm sections, and lyrical themes of death, war, politics, personal relationships and religion.
In 1985, Megadeth released its debut album, Killing Is My Business... and Business Is Good!, on the independent record label Combat Records, to moderate success. It caught the attention of bigger labels, which led to Megadeth signing with Capitol Records. Their first major-label album, Peace Sells... but Who's Buying?, was released in 1986 and was a major hit with the underground metal scene. Substance abuse and personal disputes brought Megadeth negative publicity during this period.
After the lineup stabilized, Megadeth released a number of platinum-selling albums, including Rust in Peace and Countdown to Extinction. These albums, along with worldwide tours, brought them public recognition.