Within SongKongs Logs folder there are two types of log files:
songkong_user.log
songkong_debug.log
The songkong_user.log is a summary record of the tasks done by SongKong, the most current file is always the songkong_user0-0.log file.
The songkong_debug.log is a more in depth debugging log of the tasks done by SongKong, the most current file is always the songkong_debug0-0.log file.
Logs are rotated and recycled. For example once songkong_debug.log gets to a certain size it is renamed to songkong_debug0-1.log and songkong_debug0-1.log gets renamed to songkong_debug0-2.log and so on up to songkong_debug0-9.log. At this point they get recycled so the information in songkong_debug0-9.log is lost.
They can be completely emptied using the Empty Log Files option from the Admin menu.
The current log can be viewed from within SongKong via Preferences:Support