05.22.13 3:16 AM ET
Celebs Sing for Teen with Cancer
17-year-old Zach Sobiech passed away Monday from osteosarcoma. Before he died, he wrote and recorded the song 'Clouds.' Here, friends and celebrities, from Bryan Cranston to Sarah Silverman, sing along, and Zach had two weeks to see this video before going where 'the view's a little nicer.'