It's showing in the (old) demo video [0] and makes it possible to query the data...

dewey on March 4, 2014 | parent | context | favorite | on: Beets – Command-line music manager and auto-tagger

It's showing in the (old) demo video [0] and makes it possible to query the database through a web interface. Maybe the web interface isn't enabled by default, add the plugin [1] to enable it.

[0] http://beets.radbox.org/

[1] http://beets.readthedocs.org/en/v1.3.3/plugins/web.html