Three Young Sisters Unleash a Fearless “Enter Sandman” That Left Even Metallica Fans Speechless

During the summer of 2014, a small home video changed everything for three sisters from Monterrey, Mexico. Daniela, Paulina, and Alejandra Villarreal, performing as The Warning, recorded their take on Metallica’s “Enter Sandman” in their living room. The setting was simple, but the performance was explosive. With Daniela on guitar and vocals, Paulina tearing into the drums, and Alejandra thumping the bass at just 9 years old, it was raw, loud, and unforgettable.

When they uploaded the video to YouTube, they had no idea it would reach millions. Their version of “Enter Sandman” quickly went viral, not just for the novelty of three kids playing metal, but for how good they actually were. Paulina’s drumming especially caught the internet’s attention—her fierce energy, complex fills, and flawless timing earned comparisons to seasoned pros.

The sisters weren’t new to music, though. Raised in a home where rock classics were always playing, they each started learning instruments as early as five. Their parents encouraged them, but it was never forced. They weren’t prodigies by pressure—it was just genuine love for music. Their early covers included AC/DC, Muse, and Pink Floyd, but Metallica’s power was what truly ignited their spark.

The girls also had classical training to back their skills. Daniela and Alejandra both studied at the Berklee College of Music’s summer programs—opportunities they earned through scholarships, thanks to the attention their Metallica cover brought them. It’s not every day three kids get invited to Berklee after posting a YouTube video, but The Warning were far from ordinary.

What made their “Enter Sandman” cover so magnetic was its authenticity. They weren’t trying to be viral or cute—they were just rocking out, fully immersed in the music. That sincerity resonated with fans. Their confidence, especially for their age, was jaw-dropping. They didn’t just play the song—they attacked it.

Soon after the video went viral, Metallica themselves took notice. Kirk Hammett shared the video on social media, and other fans of the band flooded the comments with praise. The video became a rallying point for a new generation of rock lovers, many of whom hadn’t seen kids play metal this seriously since the likes of School of Rock.

Their rise wasn’t a one-time internet hit. The Warning kept going, building their fanbase steadily. They released their first EP, “Escape the Mind,” in 2015, packed with original songs that showcased their growing songwriting talents. The EP wasn’t just competent—it was good. Rock blogs and radio stations began to take them seriously as young artists with long-term potential.

In live shows, their energy was undeniable. Paulina would often scream and headbang while playing intense drum fills, while Daniela’s guitar solos had a precision well beyond her years. Alejandra, the youngest, held her own with a steady, almost stoic presence, creating a perfect balance. The Warning weren’t just a novelty—they were a real band, and their chemistry was electric.

By 2017, they had launched a successful crowdfunding campaign to record their first full-length album, “XXI Century Blood.” Their fans responded with overwhelming support, helping them hit their goal in just a few days. The album was released independently and caught the attention of music publications worldwide.

Their lyrical themes evolved, too. The girls began writing about identity, rebellion, growing up, and navigating a chaotic world—all through the lens of heavy rock. Critics noted their music had matured faster than expected. Still teenagers, they were already tackling topics with more substance than many adult rock acts.

Despite their youth, they remained fiercely independent. Their parents managed them early on, but the girls had a strong say in every creative decision. They didn’t let the industry mold them into something they weren’t. That defiance became part of their appeal—they were young, talented, and completely in control of their message.

As their fame grew, The Warning started touring internationally. They played in Colombia, Spain, and the United States, earning rave reviews for their live performances. They often opened for bigger acts, but more and more fans came just to see them. Each show brought a new wave of listeners who left blown away by what they had witnessed.

Over time, their style evolved. Their sound became heavier, more layered, and lyrically darker. Yet they never lost the spark that made their Metallica cover so iconic—that mix of youthful passion, technical skill, and emotional sincerity. The original fans stuck with them, and new ones joined in droves.

Looking back, “Enter Sandman” was more than a viral video—it was a declaration. It introduced the world to three sisters who were ready to shake up the rock world. It wasn’t about being cute kids with instruments. It was about reminding everyone that rock was still alive—and that its future might just be in the hands of three fearless girls from Mexico.

As of 2025, The Warning has released multiple albums, signed with Lava Records, and performed on global stages. But fans still return to that 2014 video—the moment it all began. It’s not just nostalgia. It’s a reminder of when three young girls picked up their instruments and roared into the world’s ears.And that roar hasn’t quieted one bit.