id3ren is used to rename batches of mp3 files by reading the ID3 tag at the end of the file which contains the song name, artist, album, year, and a comment. The secondary function of id3ren is a tagger, which can create, modify, or remove ID3 tags. The id3 fields can be set on the command line, entered interactively, or "guessed" from the path and the filename.