A Minnesota teenager who died May 20 from a rare form of bone cancer has become a global role model for others battling serious illness. Zach Sobiech’s song “Clouds” is a viral hit, reaching Number One on at least one digital music chart, but it made a bittersweet debut this week on Billboard’s Hot 100. “Clouds” was inspired by his girlfriend Amy Adamle and written as a goodbye to friends and family when he learned he had only months to live.