In 1980 the Dead found a nearly perfect Midwestern summer home at the Alpine Valley Music Theatre, nestled in a ski resort equidistant to Chicago, Milwaukee, and Madison. Unlike nearly all their future stops at Alpine Valley, their 1980 debut wasn’t sold out, with perhaps some extra dancing room on the almost comically steep lawn. With the sun just setting over the trees, the Dead open up the sunshine cascades of Bob Weir and John Perry Barlow’s disco-prog “Lazy Lightning”>“Supplication,” still sounding crisp and current at the dawn of the new decade.