What is the release title of the single under the "funk" tag that was released the oldest?
release title of single refers to groupName where releaseType = 'single'; the oldest means coming before all others in time and refers to MIN(groupYear);
SELECT T1.groupName FROM torrents AS T1 INNER JOIN tags AS T2 ON T1.id = T2.id WHERE T2.tag LIKE 'funk' AND T1.releaseType = 'single' ORDER BY T1.groupYear LIMIT 1