Dying teen gives his family a beautiful song to remember him by

This video starts with a not-so-simple question: "When faced with months to live, how do you say goodbye?" If you're Zach Sobiech, you express yourself with your voice, your guitar and your heartfelt lyrics. The 17-year-old has osteosarcoma, an aggressive form of bone cancer, and after it spread to his pelvis and lungs, the teen was told that he'd exhausted all of his treatment options. He'll leave behind a loving family and "Clouds," his heartbreaking pop song. "And everything would be just right," he sings. "And maybe someday I'll see you again." Until then, Zach. Until then.

Click to see more on msnNOW.com, updated 24 hours a day.