Other Databases Relationship Type/Whitelist
Generalistic pages
Rate Your Music (http://rateyourmusic.com/)
WorldCat (http://www.worldcat.org/): International network of library holdings; can include tracklists, track lengths, labels, catalog numbers, credits and ISBNs (which can be translated into bar codes) [needs JS cleanup to turn stuff into http://www.worldcat.org/oclc/*********]
MusicMoz (http://musicmoz.org/)
Regional pages
Musik-Sammler (http://www.musik-sammler.de/): German database, tends to have stuff that is not on Discogs and the like
Discografia Nazionale della canzone italiana (http://discografia.dds.it/): Italian database, especially useful for older releases, includes tracklists, labels, cat#s, credits and sometimes cover art
ESTER (http://www.elnet.ee/ester/): Estonian library database; fairly complete, often including cat#s, full tracklists and even writing and performance credits - of course it's fairly niche, but hey, so is other stuff
Encyclopedisque (http://www.encyclopedisque.fr/): French vinyl stuff - we already have permission for using their cover art, but since we're moving cover art stuff to the CAA, it'd be nice to have a more "legit" way of linking to them
Discos do Brasil (http://www.discosdobrasil.com.br/): Brazilian music database based on the creator's private collection. Not publicly editable, but contains over 6000 Brazilian releases with detailed credits. (example)
ISRC查詢系統 (http://isrc.ncl.edu.tw/): Taiwan ISRC database maintained by the National Central Library, with ISRC data and cover scans. Note that the track order may not match physical releases, since tracks are sorted by ISRC code.
Genre pages
Electronic
rolldabeats (http://www.rolldabeats.com/): thousands of "dance music" (dnb etc) releases, including a decent amount of white labels.
psydb (http://www.psydb.net/): 8924 psytrance releases, with label/cat#/tracklist info. however no updates since 2009
Metal
Metal-Archives (http://www.metal-archives.com/): the place to find obscure demos from Montenegrin black metal bands (literally: http://www.metal-archives.com/albums/Zaimus/Demo_2007/251573 ) It is by far the most complete metal database. A release page is more like a release group, with the original release in it, and other releases details in the annotation.
Spirit of Metal (http://www.spirit-of-metal.com/) looks like it copied Metal-Archives' database, but then added stuff like non-metal bands, compilations. Should be considered less accurate for everything already in M-A.
Theatre
Merge IBDb (284 uses in total) and IOBDb (17 uses in total) into this (for some comparison: conductor position was added yesterday and has been used 180 times).
Theatricalia (http://theatricalia.com/): they have some MB links and someone asked if we could link to them http://wiki.musicbrainz.org/Talk:Proposals/History#Theatricalia - can anyone familiar with this kind of stuff tell me if the content is any good and it makes sense to link? Their stuff is under CC database licenses http://theatricalia.com/about
Videogame music
OCRemix (http://ocremix.org/): games music - not only their own stuff, which is already a lot: they also have "work" pages for videogame music, and even chiptunes for some of them (http://ocremix.org/song/1022)
Other
http://www.45cat.com/ -- dedicated to 7"/45s only. Very clean, extensive and reliable site.
