Sufjan Stevens is known as an indie pop darling, and many of his songs are quite folksy, with the banjo often being his primary instrument. Yet on this collaborative album the vibe is much more futuristic, electronic. Normally I would say that auto-tune is the devil’s work, but pairing it with Sufjan’s already-unearthly vocals creates a sound that is nearly sublime. Each track is named after a planet or some other aspect of the solar system; some are techno jams, some are soft and wistful, and some are instrumental and ambient. Planetarium is one of those albums you can – and perhaps should – listen to start to finish.