Vocal harmonies take center stage for Rob Thomas and Charles Kelley, who find common ground being the leads of musical groups (Matchbox 20 and Lady Antebellum, respectively), as well as solo artists. The magical episode features hits from Thomas, including "Lonely No More," "This is How a Heart Breaks," "Pieces," "Smooth," and the Matchbox 20 hit "3 AM"; as well "Lonely Girl," from Kelley's recent solo album, and the popular Lady Antebellum cuts "We Owned the Night" and "Love Don't Live Here Anymore."

Nick Jonas and Thomas Rhett blend their styles effortlessly in the electric hour which showcases each of their hits including Jonas' "Chains," "Jealous" and "Close" featuring surprise guest country songbird Danielle Bradbery, along with the new song "Chainsaw," from Jonas' forthcoming album, "Last Year Was Complicated"; and Rhett's "Die a Happy Man," "Crash and Burn," Make Me Wanna" and "T-shirt." Special guest John Oates joins Jonas and Rhett on a cover of the Hall & Oates classic, "Rich Girl."

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