Just ahead of the new season of "Nashville" on ABC, two of the show's stars have released a new haunting and beautiful duet. This time Lennon and Maisy Stella, who we first heard from way back in 2012, cover Charlie XCX's hit "Boom Clap".

Their version of what I generally think of as an upbeat pop song is so slowed down and perfect, I guarantee you'll listen to it over and over again.

This is the first video that the sisters have uploaded to their YouTube channel in nearly a year, and they've popped back up in stellar fashion.