Chris Milk, who has directed videos for Kanye West, U2, Courtney Love, and Barack Obama, is assembling a few thousand volunteers to complete an animated music video for Ain't No Grave, title track of the last album Johnny Cash recorded. The Johnny Cash Project invites participants to use custom drawing tools to create the 1,368 frames in the 2 minute, 51 second, video. Since more than one artist will end up submitting artwork for each frame, the video will look different each time it's played. Writes Milk: Strung together and relayed in sequence, your art, paired with Johnny’s haunting song, will become...