But what made them famous to the eyes of music lovers, is their incredibly energetic covers of rock and metal songs.
The sisters, who play the electric guitar and bass, respectively, have covered many rock artists such as Metallica, Nirvana, System of a Down, Rage Against the Machine, My Chemical Romance, and even the legendary British rock group Queen.
According to Mashable, the duo learned to play the instruments through “Rocksmith,” a music video game from Ubisoft that helps people learn guitar.
A lot of their fans seem to love how authentic their enthusiasm is whenever they are in front of the camera.
They even did a cover of Slipknot’s “Psychosocial.”
While Audrey and Kate’s signature content are rock cover songs, they also sometimes do pop music like Taylor Swift’s “Shake It Off” and “We Are Never Getting Back Together.”
But of course, with their own high energy metal twist.
Here’s also their take on “September” from the hit group Earth, Wind, and Fire.