Conversation so far:
What is the Day of the Dead?
Day of the Dead features collaborations and recordings from a diverse group of artists.
What artists worked on DOD?
including Wilco, Flaming Lips, Bruce Hornsby, Justin Vernon, the National, The War on Drugs, Kurt Vile, Lee Renaldo of Sonic Youth, Ira Kaplan of Yo La Tengo.

Question: What year was DOD done?
Self-contained rewrite: What year was the Day of the Dead album done?