Country star Blake Shelton is mourning the loss of singer-songwriter Jimmy Buffett. Taking to social media, Shelton expressed his heartbreak and paid tribute to Buffett's immense talent and impact. The two artists had a special connection over a song and Shelton's TV show, "Barmageddon." Buffett wrote the theme song for the show, which Shelton described as perfect. Buffett, known for his beach-inspired music and brand, died peacefully surrounded by his loved ones and dogs. TMZ has reported that the cause of death was skin cancer turning into lymphoma.