Country superstar Blake Shelton is heartbroken over the death of iconic singer/songwriter Jimmy Buffett. Shelton revealed that Buffett wrote the theme song for his show Barmageddon and praised Buffett's talent and impact. Jimmy Buffett, leader of the Parrotheads, passed away at the age of 76, surrounded by loved ones. Although the official cause of death has not been disclosed, sources say he had battled skin cancer that turned into lymphoma. Buffett was known for his laid-back style and hits like "Margaritaville" and "Changes in Latitudes, Changes in Attitudes." He also had a successful business empire and was actively involved in philanthropy. Buffett is survived by his wife and three children.