Planetarium is a collaborative album featuring Bryce Dessner of the indie rock band The National, drummer James McAlister, contemporary classical music composer and arranger Nico Muhly, and singer-songwriter Sufjan Stevens. The album was released by 4AD on June 9, 2017. The group announced the recording on March 26, sharing the album's track listing along with the song "Saturn".

Nico Asher Muhly is an American contemporary classical music composer and arranger who has worked and recorded with both classical and pop musicians. A prolific composer, he has composed for many notable symphony orchestras and chamber ensembles and has had two operas commissioned by the Metropolitan Opera. Since 2006, he has released nine studio albums, many of which are collaborative, including 2017's Planetarium with Sufjan Stevens, Bryce Dessner & James McAlister. He is a member of the Icelandic music collective and record label Bedroom Community.