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CDDB was designed around the task of identifying entire CDs, not merely single tracks. The identification process involves creating a "discid", a sort of "fingerprint" of a CD created by performing calculations on the track duration information stored in the table-of-contents of the CD (see the following section for an example calculation).
Below is a table of online music databases that are largely free of charge. Many of the sites provide a specialized service or focus on a particular music genre . Some of these operate as an online music store or purchase referral service in some capacity.
MusicBrainz was founded in response to the restrictions placed on the Compact Disc Database (CDDB), a database for software applications to look up audio CD information on the Internet. MusicBrainz has expanded its goals to reach beyond a CD metadata (information about the performers, artists, songwriters, etc.) storehouse to become a ...
Gracenote is known for MusicID, a music recognition software which identifies compact discs and delivers artist metadata and cover art to the desktop. The Gracenote database includes music genre and mood information, TV show descriptions, episode information, and channel line-ups, movie cast and crew information, and sports statistics and results.
In database terminology, this set of metadata is referred to as the catalog. The SQL standard specifies a uniform means to access the catalog, called the information schema, but not all databases implement it, even if they implement other aspects of the SQL standard. For an example of database-specific metadata access methods, see Oracle metadata.
Freedb was a database of user-submitted compact disc track listings, [1] where all the content was under the GNU General Public License. To look up CD information over the Internet, a client program calculated a hash function from the CD table of contents and used it as a disc ID to query the database. If the disc was in the database, the ...
Voice search engine: Allows the user to search using speech instead of text. It uses algorithms of speech recognition. An example of this technology is Google Voice Search. [1] Music search engine: Although most of applications which searches music works on simple metadata (artist, name of track, album…) .
A cue sheet, or cue file, is a metadata file which describes how the tracks of a CD or DVD [citation needed] are laid out. Cue sheets are stored as plain text files and commonly have a .cue filename extension. CDRWIN first introduced cue sheets, [1] which are now supported by many optical disc authoring applications and media players.