ABC's Nashville returns tomorrow with what's set to be a jam-packed episode as Connie Britton's aging country star Rayna Jaymes contemplates the future of her relationship with Deacon, her guitarist and bandleader, played by Charles Esten. Deacon is busy helping up-and-comer Juliette Barnes, played by Hayden Panettiere, while her mother struggles with addiction. Meanwhile, as Scarlett O'Connor (Clare Bowen) grapples with the next step in her career, tension continues to mount between the two men after her heart, her boyfriend Avery Barkley (Jonathan Jackson) and her musical partner Gunnar Scott (Sam Palladio). Amid all the drama and flare-ups, there's plenty of music and now you can check out this exclusive clip from tomorrow's episode, which finds Scarlett and Gunnar performing a gorgeous, heartbreaking duet while Avery plays along on guitar. And to further whet your appetite, be sure to check out our recap of last week's episode of Nashville.