Kid sisters Lennon and Maisy Stella performing a rendition of Robyn's "Call Your Girlfriend" has nearly one million views in the first two days since it was posted on YouTube.
Twelve-year-old Lennon is the main vocalist, while little sister Maisy, 8, has pretty much mastered the harmonies.
They sing with only two plastic margarine tubs and microphones.
Erato, a female vocal trio comprised of Ebba Lovisa Andersson, Amanda Wikström and Petra Brohäll, first covered Robyn's song using only their voices and plastic cups in 2011 and now Lennon and Maisy have followed suit.
The sisters are the daughters of Nashville musicians Brad and Mary-Lynne Stella and live in Leiper's Fork, about 30 miles south of Nashville.
The family appeared on ABC's "Good Morning America" Friday morning.