rb_cdio is a library for Ruby that creates a module CdIo and several classes to use the libcdio and libccdb library. The use of libcddb is optional. The libcdio package contains a library which encapsulates CD-ROM reading and control. Applications wishing to be oblivious of the OS- and device-dependent properties of a CD-ROM can use this library. Libcddb is a C library to access data on a CDDB server (freedb.org). It allows you to: 1. search the database for possible CD matches; 2. retrieve detailed information about a specific CD; 3. submit new CD entries to the database.