// format:
/*
#SOMEPLAYLIST
- #META [seconds],::artist::,::album::,::title::
+ #META [ID][seconds],::artist::,::album::,::title::
#PATH file_path
- #META [seconds],::artist::,::album::,::title::
+ #META [ID][seconds],::artist::,::album::,::title::
#PATH file_path
...
*/