"That's what I'm for, that's what I do," Merle Haggard, "poet of the common man," said about the music that has catapulted him to stardom.

"The Hag" met with TODAY show correspondent Jenna Bush Hager to discuss why retirement is "not in the picture" as he continues to tour at age 75. The two also talked about the Johnny Cash concert in San Quentin prison that inspired Haggard to turn his life around, and the battle with lung cancer that nearly ended his career a few short years ago.

The country music legend has continued his prolific music career with his 2010 album, "I Am What I Am," and received a lifetime achievement award from the Kennedy Center in the same year for his work.

Check out the video above for more from Haggard.