Description:Zach Sobiech is racing against the clock to write as many lyrics as possible. Time is against the 17-year-old from Minnesota. Three years ago, Zach was diagnosed with Osteosarcoma a rare bone cancer. Since then, he’s had 10 surgeries on his hip and lungs, endless chemo and now only three months to live. Knowing the end is near Zach decided to say goodbye the best way he knows how.(1:12)