Jon Foreman (Switchfoot), Dustin Kensrue (Thrice), Propaganda and Aaron Marsh (Copeland) performed a live collaborative cover of Tom Petty's "I Won't Back Down."
The performance occurred as part of Heavy and Light, an annual concert event hosted by the organization To Write Love On Her Arms. All of the musicians have been longterm partners with the charity, which aims to raise awareness, support and fund treatment around issues of mental illness and addiction. 
Each of the vocalists took a section of the song, and Propaganda added a freestyle spoken word verse to the Tom Petty classic. Also on stage with the musicians were opening band Nekokat and Josh Morales, an audience member and amateur guitarist who Jon Foreman had invited to share the stage with him.
After the completion of "I Won't Back Down," which was the encore for the evening, Jon Foreman suggested the artists all stay on stage for a group performance of "Lean On Me," which concluded the night. Foreman, who has been involved with the event since it began a decade ago, said of the evening "What an amazing night! My favorite #HeavyAndLight ever."
You can find a full stream of the entire evening on TWLOHA's Facebook page by clicking here.
