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I'm heartbroken to tell you that Zach Sobiech died yesterday.  Zach was the high school senior with terminal cancer, who wrote that song "Clouds" that became a hit on YouTube.  

Zach had osteosarcoma, which is a kind of bone tumor, and when he recorded "Clouds" he already knew he only had a few months to live.

If you haven't heard Zach's story, you really need to watch this, but be sure to grab some tissues before you do:

Source: CNN