Sometimes most TAG info of many songs (like CD tracks from CD disk, songs with the same comments, etc) is the same, and some different on each track. The part of TAG info that is same for all songs may be edited once at the beginning and afterwards may be used as defaults. To do this you have to check boxes opposite to needed fields and fill those fields.

Three radio buttons at the upper part of the page are used to define rules of application of default info.