“Early Start” brings you a story of a brave 17-year-old Minnesota teen. Diagnosed with terminal cancer, Zach Sobiech doesn’t expect to live to see his 18^th birthday but he is determined to leave behind a musical legacy. CNN’s Ed Lavandera has his story.

“Zach Sobiech’s soul is filled with lyrics racing against time to get out,” Lavandera says. Zach was diagnosed with a rare bone cancer three years ago. After ten surgeries and endless chemotherapy, his doctor has told him he has just months to live. His mother has since suggested he write letters goodbye to family and friends.

“I am awful at writing,” Zach says. “I can’t sit down and write a letter. I’ve tried. I decided to pick up my guitar to start playing music.”

“That’s how his song called ‘Clouds’ was born,” Lavandera says, “a goodbye to those he loves.”

“It’s kind of me always being there for them,” Zach says. “If they keep singing that song throughout their whole life out, I’ll be right there next to them the whole way.”

He can’t stop writing lyrics now, “there are so many songs he wants to leave behind,” Lavandera says. “I can’t really put on the breaks at all,” Zach says, “I can’t wait for anything.”

“Turning the heartache of cancer into unforgettable melodies is Zach Sobiech’s final wish on this long goodbye.”