The co-founder and guitarist died this past February.
The new documentary features just about half of Hollywood taking an… ahem… trip down memory lane.
Posthumous collection includes the newly unearthed 1982 track “Keep a Little Soul” and dozens of other unreleased tracks.
St. Vincent, John Legend, and Zach Galifianakis cover “Lovin’ You” to announce the benefit project.
The song was released to coincide with the unveiling of a new mural designed by Shepard Fairey.