I'm looking for a Linux application which can add a new tag to a mp3, like foobar2000 does under Win.
Command line apps like id3v2 can only manage already present tags.
Any clue?
Many thanks
Try eyeD3 (http://eyed3.nicfit.net/) or python module mutagen (http://www.sacredchao.net/quodlibet/wiki/Download).
If you like foobar's masstagging, you'll probably like Ex Falso (which is the standalone tagger that comes with the music player Quod Libet).
http://www.sacredchao.net/quodlibet (http://www.sacredchao.net/quodlibet)