Just days after his death, a teenager's goodbye message to his friends and family, a song he wrote named "Clouds", is the number one selling song on iTunes.
Zach Sobiech, the 18-year-old star of an internet video that went viral, passed away early Monday morning surrounded by friends and family.
In the past few weeks, donations to Zach's cause, the Children's Cancer Research Fund, increased immensely, as did downloads of his song, "Clouds," which has more than 2.9 million page views on YouTube.