About six months ago, Sufjan Stevens released the sweeping, ambitious album Ascension. Two days after its release, Stevens’ biological father died. In response, Stevens started working on a massive, overwhelming new project called Convocations. That project swiftly took on extreme dimensions. Next month, Stevens will release Convocations as a five-volume album. It’ll include 49 tracks, run for two and a half hours, and explore the five stages of grief.