RBrainz is a Ruby client library to query the
MusicBrainz database using the MusicBrainz XML Web service. It follows the design of the MusicBrainz
client library reference implementation, and
supports the MusicBrainz XML Metadata Schema
Version 1.4.
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This version features querying of collections,
user authentication and querying of user
information, PUID submission, support for label
aliases, and complete support for the MusicBrainz
metadata scheme 1.2 (including the upcoming
tagging).