When The Warning debuted before the world, the headlines were eye-popping. "These Girls Started a Totally Badass Metal Band and Their Bassist Is Only 10" was at the top of a BuzzFeed News article. People begged readers to "Stop Everything and Watch These Teen Girls Play Metallica's Enter Sandman."

The Villarreal Sisters did exactly that — they covered "Enter Sandman" on their YouTube channel in 2014. More than 18 million views later, the sisters from Monterrey, Mexico, are signed to Nada Mas Records and have opened shows for Def Leppard and The Killers (they also were the first Mexican band to ever appear on The Ellen Degeneres Show).

But teens Daniela, Paulina, and Alejandra proved to be much more than just a viral sensation. They have toured through Mexico, played in much of the United States, and graced festival stages alongside heavy metal stars like Mastodon, Iron Maiden, and even Ozzy Osbourne at Corona Hell & Heaven in Mexico City. Led by Daniela's authoritative vocals, Paulina's sinister drumming (which has garnered praise from Metallica's Kirk Hammett), and a menacing live show, The Warning can flat-out shred.

The Warning Background

Hailing from the northeastern Mexican city of Monterrey, Daniela and Paulina — the two oldest Villarreal sisters — started taking piano lessons while their parents exposed them to contemporary rock bands like Muse and AC/DC. In 2007, when the sisters were 6 and 8 years old, they took to playing the Rock Band video game while their three-year-old sister, Alejandra, looked on.

As they got older, the girls set down the video-game instruments in favor of guitar (Daniela), drums (Paulina), and bass (Alejandra) and started recording their rehearsals and uploading them to a modest YouTube channel. It was all just fun and games until a 2014 YouTube clip of the sisters playing Metallica's "Enter Sandman" went viral and changed the course of their lives.

It led them to record their debut EP, Escape the Mind, in 2015 and continue to capitalize on their newfound notoriety playing high-profile shows in Mexico. As their introduction to the world has progressed and people have recognized them as bona fide artists, The Warning have released two LPs — 2017's XXI Century Blood and the polished 2018 Nada Mas follow-up, Queen of the Murder Scene.