Tagging

Tagging is storing the information about a song (title, artist, genre, etc) into the audio file. This makes the file self documenting.

 

A lot of media player software supports tagging.
Sometimes you might be in need of more powerful options than the standard one.
MP3Tag is a popular piece of freeware.

 

• Write ID3v1.1-, ID3v2-, APEv2-Tags and Vorbis Comments to multiple files at once
• Full Unicode support
• Support for embedded cover art
• Automatically create playlists
• Recursive subfolders support
• Remove parts or the entire tag of multiple files
• Rename files based on the tag information
• Import tags from filenames
• Format tags and filenames
• Replace characters or words from tags and filenames
• Regular Expressions
• Export tag information to user-defined formats (like html, rtf, csv, xml)
• Import tag information from online databases like freedb or Amazon (also by text-search)
• Import tag information from local freedb databases
• Support for ID3v2.3 (ISO-8859-1 and UTF-16) and ID3v2.4 with UTF-8

It has lots of options.

An example of the scripting option can be found here.
I used the scripting options to derive opus numbers from compositions. Saved me a lot of typing.