CREATE TABLE tags (index DECIMAL, id DECIMAL, tag TEXT)
CREATE TABLE torrents (groupname TEXT, totalsnatched DECIMAL, artist TEXT, groupyear DECIMAL, releasetype TEXT, groupid DECIMAL, id DECIMAL)

Name the most popular release on houston.
SELECT T2.groupname FROM torrents AS T2 JOIN tags AS T1 ON T1.id = T2.id WHERE T1.tag = "houston" ORDER BY totalsnatched DESC LIMIT 1
SELECT "T2"."groupname" FROM "torrents" AS "T2" JOIN "tags" AS "T1" ON "T1"."id" = "T2"."id" AND "T1"."tag" = "houston" ORDER BY "totalsnatched" DESC NULLS LAST LIMIT 1