The CDDB module implements a Perl class for communicating with an audio compact disc database through the CDDBP protocol. It allows querying the database and submitting new entries to it via e-mail (the Mail::Internet and Mail::Header modules are required for submitting, but their absence won't affect other functions). Unlike its analogs, CDDB.pm doesn't try to read a disc in your CD-ROM by itself, but relies on the main program supplying disc data. Therefore, it is particularly useful for developing software that deals with alternative media, such as MPEG audio files.