Sufjan Stevens has been making new music at a wild pace lately. Less than a year ago, Stevens released the ambitious LP The Ascension. Shortly after that album’s release, Stevens’ biological father died, and he responded to that loss by making Convocations, a five-volume work of emotive instrumental music. Convocations just came out two months ago, and now Stevens has announced another new album, set to arrive this fall. It’s called A Beginner’s Mind, and it’s a full-album collaboration with Angelo De Augustine, a folk-pop musician from Los Angeles who has worked with Stevens many times over the years.