Only insert a song if it doesn't already exist.
[ccbs] / parse /
drwxr-xr-x   ..
-rw-r--r-- 7775 parse-ddreurope-tournament.pl
-rw-r--r-- 3384 parse-ddrfreak-songlist.pl
-rw-r--r-- 1904 parse-wiki-songlist.pl