How many singles were released in 1979?
releaseType = 'single'; groupYear = 1979;
SELECT COUNT(releaseType) FROM torrents WHERE releaseType LIKE 'single' AND groupYear = 1979
database name:db_id music_tracker
torrents table torrents Cols: groupName dtype text, totalSnatched dtype integer, artist dtype text, groupYear dtype integer, releaseType dtype text, groupId dtype integer, id dtype integer, 
tags table tags Cols: index dtype integer, id dtype integer, tag dtype text, 
