Info Plugin
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The "info" plugin provides a command that dumps the current tag values
for any file format supported by beets. It works like a supercharged
version of mp3info or id3v2.

Enable the "info" plugin in your configuration (see Using Plugins) and
then type:

   $ beet info /path/to/music.flac

and the plugin will enumerate all the tags in the specified file. It
also accepts multiple filenames in a single command-line.

You can also enter a query to inspect music from your library:

   $ beet info beatles

If you just want to see specific properties you can use the "--
include-keys" option to filter them. The argument is a comma-separated
list of field names. For example:

   $ beet info -i 'title,mb_artistid' beatles

Will only show the "title" and "mb_artistid" properties.  You can add
the "-i" option multiple times to the command line.

Additional command-line options include:

* "--library" or "-l": Show data from the library database instead of
  the files' tags.

* "--album" or "-a": Show data from albums instead of tracks (implies
  "--library").

* "--summarize" or "-s": Merge all the information from multiple files
  into a single list of values. If the tags differ across the files,
  print "[various]".

* "--format" or "-f": Specify a specific format with which to print
  every item. This uses the same template syntax as beets’ path
  formats.

* "--keys-only" or "-k": Show the name of the tags without the values.
