Celebrities unite to pay tribute to inspirational, dying teen

Doctors say 17-year-old Zach Sobiech has, at most, one year to live.

Diagnosed at the age of 14, Sobiech has been battling osteosarcoma, a rare bone cancer, for the past three years.

Choosing to embrace his fate, and make the most of his time left, Sobiech has been writing and recording music as a way to say goodbye to loved ones. These goodbye letters in song form have made their way around the Internet and onto TV.

The farewell song, Clouds, launched Sobiech into the limelight after the video went viral on YouTube. The young star now has a recording contract, performs live in concert, and finished recording a CD with his band A Firm Handshake.

The song writer's incredible journey also caught the attention of celebrities such as Seattle's Rainn Wilson who worked to create a tribute video for Sobiech.

Jason Mraz, Anna Faris, The Lumineers, Phillip Phillips, Ashley Tisdale, Colbie Caillat, Ed Helmps, Rachel Bilson, and Jenna Fischer, just to name a few, all hope to garner awareness and donations to find a cure.

Wilson posted the compilation on his Youtube Channel.

Sobiech's family has started a foundation in his name to help make a better tomorrow for children with the disease.