[5] The band first gained widespread notice later in 2014 when, at ages 9 through 14,[6] their YouTube video in which they performed Metallica's "Enter Sandman" went viral among rock fans, eventually earning more than 26 million views.[7][8][9] The video received attention from Metallica guitarist Kirk Hammett, who offered particular praise for Paulina, saying, "The drummer kicks maximum ass![17] During this period the sisters raised funds, including a $10,000 donation each from DeGeneres and the Target Corporation,[17] to attend a five-week training program at Berklee College of Music in the United States.[37] The six-song EP Mayday was released in October 2021,[1][38] and The Warning embarked on a tour of North America in early 2022, performing more than 30 dates as headliners plus opening for Foo Fighters, Sammy Hagar and the Circle, and Stone Temple Pilots.[44][45][39] Later that year they toured Canada while supporting Three Days Grace and opened a show for Guns N' Roses in their home city of Monterrey, Mexico.In Spring 2024, they released five more new singles from the upcoming album: "S!CK", "Hell You Call a Dream", "Qué Más Quieres", "Automatic Sun" and "Burnout".In July The Warning were featured as artists of the month on MTV Push [58] – a promotional event that includes exclusive videos of them performing songs and also interviews.[66][67] For the Spring of 2025, the band anounced multiple locations of their upcoming "Keep me Fed" tour: in Mexico (including 3 nights at Auditorio National), in South-America and also in Europe.They named Metallica, Muse, My Chemical Romance, Pink Floyd, Queen, Paul McCartney, Neil Peart, David Gilmour, Placebo, Badflower, Paramore, K-pop and J-rock as musical influences.