In 2013, the heavy metal titans Metallica made history by becoming the first musical act to perform on all seven continents. The record was finalized when the band played a special concert called 'Freeze 'Em All' inside a dome at the Argentine Carlini Station in Antarctica. To protect the fragile environment, the concert was performed without traditional amplifiers; instead, the sound was transmitted to the audience of 120 people via headphones, making it a 'silent disco' style rock show. By performing on North America, South America, Europe, Africa, Asia, Australia, and Antarctica all within a single year, Metallica earned a place in the Guinness World Records. This feat solidified their reputation as one of the most hardworking and globally reaching bands in rock history.