Metallica in the context of "Bob Ludwig"

The sitar (English: /ˈsɪtɑːr/ or /sɪˈtɑːr/; IAST: sitāra) is a plucked stringed instrument, originating from the Indian subcontinent, used in Hindustani classical music. The instrument was invented in the 18th century, and arrived at its present form in 19th-century India. Khusrau Khan, an 18th-century figure of the Mughal Empire, has been identified by modern scholarship as the inventor of the sitar. According to most historians, he developed the sitar from the setar, an Iranian instrument of Abbasid or Safavid origin.

Used widely throughout the Indian subcontinent, the sitar became popularly known in the wider world through the works of Ravi Shankar, beginning in the late 1950s and early 1960s. The advent of psychedelic culture during the mid-to-late 1960s set a trend for the use of the sitar in Western popular music, with the instrument appearing on tracks by bands such as the Beatles, the Rolling Stones, Metallica and many others.

Sound City Studios is a recording studio in Los Angeles, California, United States, known as one of the most successful in popular music. The complex opened in 1969 in the Van Nuys neighborhood of Los Angeles. The facility had previously been a production factory of the English musical instrument manufacturer Vox. Throughout the late twentieth century, the studio became known for its signature sound, especially in recording drums and live performances of rock bands.

Hundreds of rock artists spanning five decades have recorded at Sound City, including Grateful Dead, Johnny Cash, Neil Young, Fleetwood Mac, Elton John, U2, Tom Petty and the Heartbreakers, Bob Dylan, Guns N' Roses, Nirvana, Red Hot Chili Peppers, Metallica, Tool, Slayer, Rage Against the Machine, Death Cab for Cutie, and Fall Out Boy. Over one hundred albums recorded at Sound City have achieved gold and platinum certifications.

The Mark Series is a line of guitar amplifiers designed and produced by California-based manufacturer Mesa/Boogie since 1972. The first "Boogies," as they were originally known, were based on a Fender Princeton modified by company founder Randall Smith to produce more power and gain. The resulting production model, the Mark I, was popularized by guitarists like Carlos Santana and Keith Richards and helped establish Mesa/Boogie as a brand. A Mark II model followed, introducing amplifier milestones like channel switching and effects loops. The line experienced a sea change in 1983 with the Mark IIC+ variant, which revoiced the amp for more aggression and midrange and tighter lows. Metallica would famously use the IIC+ on Master of Puppets, a major factor in it later becoming one of the industry's most coveted vintage amp models. Despite its success, the IIC+ was only produced for little more than a year. The Mark series, with its constantly-expanding feature set, maintained its status as Mesa/Boogie's flagship offering through Mark III and Mark IV iterations, before being supplanted by the Rectifier series in the early 1990s. Mesa/Boogie has since released Mark V and Mark VII models, as well as a John Petrucci signature version and a IIC+ reissue.

A rock concert is a performance of rock music.

During the 1950s, several American musical groups experimented with new musical forms that fused country music, blues, and swing genre to produce the earliest examples of "rock and roll." The coining of the phrase, "rock and roll," is often attributed to American, Alan Freed, a disk jockey and concert promoter who organized many of the first major rock concerts. Since then, the rock concert has become a staple of entertainment not only in the United States, but around the world.

In baseball, a closing pitcher, more frequently referred to as a closer (abbreviated CL), is a relief pitcher who specializes in getting the final outs in a close game when his team is in the lead. A closer who successfully gets the final outs for their team in the final inning of a game is recorded as a save in baseball statistics. The role is often assigned to a team's best reliever. Before the 1990s, pitchers in similar roles were referred to as a fireman and stopper. Closers typically specialize in a breaking ball of some sort in order to minimize the risk of home runs late in games, and to deceive batters into swinging away from the strike zone.

In Major League Baseball (MLB), some closers have been noted for their use of entrance music when they jog out to the mound to warm up, often to excite the fans and to intimidate the at-bat. For example, the San Diego Padres of the National League (NL) played the song "Hells Bells" by AC/DC for closer Trevor Hoffman, and the New York Yankees of the American League (AL) played "Enter Sandman" by Metallica for closer Mariano Rivera.