Master of Puppets is Metallica's third album. It was released by Elektra Records on February 21 1986. The album has 8 songs, which many feel made a permanent impact on heavy metal music. Several of its songs are still played on the radio. It is the last album to feature bassist Cliff Burton, who died in a bus accident on September 27, 1986 while touring in Sweden to promote the album. It is one of the best selling heavy metal albums.