Get out the tissues, you’re gonna need them.

Remember Zach Sobiech? The inspiring teen cancer patient whose song, “Clouds” shook the world as he lived out his last few days on camera? His touching lyrics and bold documentary video touched millions as we watched him say his final goodbye to his parents, siblings and girlfriend.

Now a year past his death, fans, friends and family gathered to do something great in his honor. They covered the floors at The Mall of America on every level to join in on a rendition of his iTunes (Top ten) song, “Clouds.”

Watch the video below: