|Wikipedia||Wiki-based free general interest encyclopedia.||Free||Creative Commons||Yes|
|FreeDB||Open version of CDDB.||Free||GPL||No|
|Discogs||Commercial site, switched to a public domain license for its data in early 2008.||Free||Public Domain||artists, release groups, releases, labels|
|MusicMoz||Comprehensive directory of all things music, edited by volunteers. Imports data from MusicBrainz.||Free||MusicMoz Data Use License||Yes|
|Allmusic||Commercial site. Part of content is freely available.||Free||Proprietary||artists, release groups, recordings, works|
|Gracenote (formerly CDDB)||Commercial site. Inspired MusicBrainz to start by stealing all the public data||Proprietary||No|
|Rate Your Music||Metadata database allowing users to rate and review albums. Commercial site.||Free||Proprietary||No|
|WorldCat||International network of library holdings||Yes|
|Open Library||Internet Archive's project for books (including audiobooks)||Yes|
|GD3||Commercial site. Also supports DVDs.||Proprietary||No|
|Open CD Index||Free||GPL||No|
|Jaxsta||Aggregator of content-owner supplied music credits through DDEX.||No|
|Sound Credit||Music credits platform for capturing metadata in DDEX RIN format. Also provides an online database.||No|
|SoundtrackCollector||Movie soundtrack database.||Free||No|
|VGMdb||Database of videogame music||Free||artists, labels, releases|
|Encyclopaedia Metallum||Database of bands from various forms of heavy metal music||Free||No|
|SA-CD.net||Database referencing Super Audio CDs||Free||No|
|Encyclopédisque||Database of French 7"||Free||No|
|Soundamental||Database of French singles and albums. Has catnos and barcodes||Free||No|
|45cat||Global database for 7" vinyl||Yes|
|SamplerInfos||Database of German samplers and compilations||Free||No|
|LaserDisc Database||Database cataloging all LaserDiscs ever been released. Also has information for HD DVD, CED, VHD and D-VHS releases.||Free||No|
|臺灣流行音樂資料庫||Taiwan Popular Music Database||Free||No|
|allmusic.hu||Hungary music database||Free||No|
|The Covers Project||A database of cover songs (songs performed by an artist other than the original performer). Uses MusicBrainz data.||Free||No|
|Second Hand Songs||A database of cover songs containing artists, songs and covers (80K originals, 640K cover songs and 3166 songs with samples) (2018-10-27). MB allows linking.||Free||artists, releases, works|
|coverinfo.de||Large database that lists more than 50000 cover songs and samples, main site and interface in German, but there is also a user guide in English.||Free||No|
|Metamuse||Metamuse is an ever expanding database of cover songs and remixes by major and independent record label artists from around the world. Watch videos, rate and comment on song versions by different artists. Possibly offline 2018-10.||Free||No|
|WhoSampled||Details of samples, covers and interpolations||Yes|
|International Music Score Library Project||Holds the Petrucci Music Library, an internet-based collaborative music score library.||Free||Public Domain||Yes (as "has score")|
|MusOpen||Online music library of copyright free (public domain) music. Offers free music and sheet music downloads.||Free||Public Domain||No|
- Open Directory:
- https://curlie.org/en/Arts/Music/Bands_and_Artists/ - also lists other directories at https://curlie.org/en/Arts/Music/Directories/
Data available at no cost
Free as in "Free beer, if you drink it in my bar".
- nifty little engine that deals with relating artists to each other; the database doesn't appear to be publicly available, but the service is free and in a very usable state
- Web Music Database
The following is still unsorted
- Music Plasma: http://www.musicplasma.com/ - very pretty related artist mapping database with audio clips; very little documentation so not sure where their data comes from
- UPC Database: https://www.upcdatabase.com/ - database of BarCodes including music CDs (as well as DVDs, nappies and other assorted goods)
- BPMDataBase: http://www.bpmdatabase.com/ - database of dance music tracks with their bpm for DJs - Slowly dying in 2008 due to spam submissions and no non-spam submissions.
- Wolf's Kompaktkiste: https://www.kompaktkiste.de/
- CDArchiv: http://www.cdarchiv.de - German site, database supports the Hitbase application
- VIAF - VIAF is a database that links the person name entries of national libraries together. It should contain every person that has ever released a work.
- Nederlandse Liederenbank - Database with Dutch lyrics, tunes and songs. Source for origin of (old) works. Crosslinking requested.
(please add any more you know of)
Examples of a more tightly-focused database that is crying out to be built on top of a MusicBrainz foundation:
- Sample FAQ: http://the-breaks.com/ - tells you "who sampled what from who", irregularly updated and with a hand-tooled vibe but very interesting
- Songtitle.info: http://www.songtitle.info/ - US television advert music database
- Some random guy's CD collection: http://www.ludd.luth.se/users/h-son/cd/info.html
- Echo Cloud: http://www.echocloud.net/ [not working] - database of related artists (if you like xxx then you might like yyy) based on crawling P2P networks - Down as of 2008-03.
- Cover Songs Database: http://slicks.ulyssis.org/coverdb/ - similar to above, but also tracks usage in samples - Down as of 5/24/07
- Music Recommender: http://recommender.ipsi.fhg.de/music/cds.aspx - database of related CDs (if you like xxx then you might like yyy) based on crawling music playlists Down as of 2008-03.
- MoodLogic: http://www.moodlogic.com/ - proprietary, fingerprint based. mood and genre matching "Effective March 3, 2008, Macrovision announces the end of life (EOL) of the Moodlogic music management and recommendation software."
- MusicMatch: Their database was taken offline in September, 2007, when Yahoo! aquired them. Yahoo! has since discontinued the MusicMatch software and database completely.
- Music City:"Collaborative" music and artists DB. Has content from Amazon and no copyright statement (see also thread in their forum). Beta. Does not seem to be very active as of June 2005.
- ChristianMusicPlace: http://www.christianmusic.org/cmp/artists/
- The Free Track Info Xchange: http://www.threetix.net - works with the Microsoft Deluxe CD Player, and also has a "universal" data converter (PLC)
- Daz.com - Seems to mainly source data from freedb
- Commercial Breaks & Beats: http://www.commercialbreaksandbeats.co.uk/ - UK television advert music database
- TrackType.org: http://www.tracktype.org/