Database: music_tracker
Question: How many singles were released between 1979 and 1981 labeled as "soul"?
SQL: SELECT COUNT(T2.tag) FROM torrents AS T1 INNER JOIN tags AS T2 ON T1.id = T2.id WHERE T2.tag = 'soul' AND T1.groupYear BETWEEN 1979 AND 1981 AND T1.releaseType LIKE 'single'