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'Ride The Lightning' is the second studio album by Metallica, released by the independent label Megaforce Records. Whilst still rooted in the thrash metal genre, the album showcased the band's developing musical maturity and lyrical sophistication, partially because bassist Cliff Burton he had more input in the songwriting. It was the last album to feature songwriting contributions from former lead guitarist Dave Mustaine.

'Master Of Puppets' is the third studio album by Metallica, released on March 3. It was the band's final album to feature bassist Cliff Burton, who died in a bus accident in Sweden during the album's promotional tour. It peaked at number 29 on the Billboard 200 and received widespread acclaim from critics, who praised its music and political lyrics. It is widely considered to be one of the greatest and most influential metal albums of all time, and is credited with consolidating the American thrash metal scene. It was certified six times platinum by the Recording Industry Association of America (RIAA) in 2003 for shipping six million copies in the United States, and was later certified six times platinum by Music Canada and platinum by the British Phonographic Industry (BPI). In 2015 it became the first metal recording to be selected by the Library of Congress for preservation in the National Recording Registry for being "culturally, historically, or aesthetically significant."