From the Songs index, Long press on a song needed deleting, the action bar appears above with the Delete option, but instead, you can tap on other songs before deleting. I think this should work. If the period is in the song (PDF) title they should be listing all in a group.
Otherwise run a Search if there is some other word in all the songs (PDF name).
Otherwise run a Search if there is some other word in all the songs (PDF name).