Among the releases with the tag "1980s", which one of them is the most downloaded? Please give its title.
title refers to groupName; the most downloaded refers to MAX(totalSnatched);
SELECT T1.groupName FROM torrents AS T1 INNER JOIN tags AS T2 ON T1.id = T2.id WHERE T2.tag = '1980s' ORDER BY T1.totalSnatched DESC LIMIT 1