The Johnny Cash Only His Family Knew, According to John Carter Cash

John Carter Cash opens up about his famous father.

To honor this groundbreaking singer, song writer and pioneer, CMT will air its original documentary, "Johnny Cash: American Rebel."

John Carter Cash, a Grammy-winning producer, author and singer in his own right, stopped by ABC News to reflect on his legendary father and the unique documentary that will "not only show who my father was as an entertainment and a human being, but also show how his world was formed."

But what the film really does is expose Cash's softer side and the love that permeated his very being, John says.

"There is a focus about my father's personality, of his joy and laughter," he said. "There was so much about my dad that wasn't on the surface ... my father was always much more willing to laugh than to go to the darkness. There were so many facets to the man that aren't as well known."

He continued, "He was so gentle and loving. He had so many grandchildren, he was so loving with them. Also, what I cling to most are the memories of when my father and I went on trips together, went on adventures together. He loved to fish, those memories I cherish. We had a lot of great times. The travel, the music, the performances was all part of him, but there's so much more."

Cash said even though now, he can't pick up the phone and call him or tell him about his upcoming wedding, his father is always there.

"I want him to meet my fiance," he said. "It's that kind of thing that can't happen. I want to reach out and say, 'Your grandson Jack, guess what he's doing now.' Just as with any lost loved one, that's not a possibility. But, in so many ways, he's right here. It's not just the music, it's who he was, what he stood for."

Cash is following in his father footsteps in the music industry, but definitely paving his own path and putting his own stamp on the world.

“Johnny Cash: American Rebel” premieres tonight at 9 p.m. EST on CMT.