Originally a troubled youngster who served time in San Quentin prison, Merle Haggard grew to become a country music legend.

Willie Nelson walked off stage prior to a performance in North Carolina, prompting concern about his well-being. A representative said the 85-year-old country music legend was feeling the effects of a stomach illness.

Musical rebel Waylon Jennings is best remembered for helping to popularize the grittier and more rock-influenced genre known as outlaw country music.

Singer, songwriter and actor Kris Kristofferson made it big with country songs like "Me and Bobby McGee" before starting his film career.

Shelby Lynne is a Grammy-winning country singer who gained acclaim for her album "I Am Shelby Lynne" and went on to found her own record label. She’s also appeared as Johnny Cash’s mother in the film "Walk The Line."

The son and namesake of country music pioneer Hank Williams, Hank Williams Jr.'s style combined country with Southern rock and blues.