The Grateful Dead are releasing another massive box set. Summer Magic 1985, which marked the band’s 20th anniversary tour, contains seven previously unreleased full concerts from Berkeley, California; Hershey Park, Pennsylvania; Saratoga, New York; and Columbia, Maryland. Limited to 10,000 numbered copies, it will be released on September 18th and out now is a recording of “Sugar Magnolia” from the Merriweather Post Pavilion show in Columbia, Maryland. You can listen to it on YouTube. And the Merriweather Post Pavilion show will be released as a standalone three-CD or four-CD set.