Idest is an ID3 Edit and Scripting Tool, a command line utility for manipulating ID3 tags. ID3 tag is a metadata container which supplies related information for a MP3 audio file. It allows information such as the title, artist, album, track number, etc. to be stored in the file itself.

The idest utility allows to create new tags, and to view, modify or delete the existing ones. When compiled with Guile, idest allows to write programs of arbitrary complexity for manipulating ID3 tags and to apply them to any number of files.