"Head Crusher" was the first single from American heavy metal band Megadeth's twelfth studio album, titled Endgame, which was released on September 15, 2009. The single was released on July 7, 2009. According to Roadrunner Records official website, a download of "Head Crusher" was available for 24 hours on July 7 (the availability of download ended the morning of July 8). The track was previously available for listening by calling Dave Mustaine's number, through the TheLiveLine.com, a service he launched that enables musicians to connect to their audience over the phone. The song was played live for the first time at the "Canadian Carnage Tour" on June 24, 2009. On December 3, 2009, it was announced on the official Megadeth homepage that "Head Crusher" had been nominated for "Best Metal Performance" for the 52nd annual Grammy Awards, the band's first nomination in 13 years, since "Trust".
This song is about the medieval torture device of the same name. Its lyrics portray a person who is taken underground where he is interrogated using a head crusher device to torture the answers out of him. It explains the effects it would have on one's body.