Mall of America officials said an estimated 5,000 people circled the mall's rotunda area on all four floors Thursday evening to sing Zach Sobiech's inspirational song "Clouds," the Star Tribune reported.
Dubbed the "World's Largest 'Clouds' Choir," the people sang along with the late Lakeland, Minnesota, teen's song as part of the KS95 for Kids Radiothon to benefit the Children’s Cancer Research Fund and Gillette Specialty Children's Care (video clip below by YouTube user Sergey Tolkachev).
The gathering included school, church and professional choirs, as well as everyday people who wanted to join in.
The Pioneer Press has a slideshow of the performance, which was attended by Sobiech's family.
Wiping away tears, Zach Sobiech's mother, Laura Sobiech, told the paper the performance was "was incredibly moving" and "such a fitting tribute to Zach and his song and his legacy."
Zach Sobiech died on May 20 at the age of 18 from osteosarcoma, a rare form of bone cancer. He wrote and performed "Clouds" as a goodbye song to his family and friends, and the video version of the tune went viral on YouTube.
To date, the video has more than 8.9 million views.
The Twin Cities station debuted “Clouds” during last year’s radiothon on Dec. 6.
KS95 began the annual two-day radiothon in 1999. The event continues Friday at the mall.
Last month, the Twin Cities Gospel Choir and singer Jearlyn Steele performed 'Clouds' at the 2013 Dawn of a Dream gala in Minneapolis, an annual fundraising event organized by Children’s Cancer Research Fund.