Taylor Alison Swift (born December 13, 1989) is an American country pop singer-songwriter and actress. In 2006, she released her debut single "Tim McGraw", then her self-titled debut album, which was subsequently certified multi-platinum by the Recording Industry Association of America and was nominated for the Best New Artist award at 50th Grammy Awards. In November 2008, Swift released her second album, Fearless, and the recording earned Swift four Grammy Awards, including the Album of the Year, at the 52nd Grammy Awards. Fearless and Taylor Swift finished 2008 at number-three and number-six respectively, with sales of 2.1 and 1.5 million. Fearless has topped the Billboard 200 in 11 non-consecutive weeks; no album has spent more time at No. 1 since 2000. Swift was named Artist of the Year by Billboard Magazine in 2009. Swift released her third album Speak Now on October 25, 2010.

Metallica is an American heavy metal band from San Francisco, California, formed in 1981. The band was founded when an advertisement posted by drummer Lars Ulrich in a local newspaper, was responded to by James Hetfield. Metallica's line up has primarily consisted of Ulrich, rhythm guitarist and vocalist James Hetfield and lead guitarist Kirk Hammett, while going through a number of bassists (Ron McGovney, Cliff Burton, Jason Newsted). The spot is currently held by Robert Trujillo. The band's original lead guitarist, before Hammett, was current Megadeth guitarist and lead vocalist Dave Mustaine