The Digital Library of Slovenia has (among other things) music [like this] [previously], posters [like this] and photographs [like this].
posted by tellurian on Apr 14, 2009 - 12 comments

The Aria Database is a diverse collection of information on over 1000 operatic arias.
posted by Gyan on May 4, 2006 - 6 comments

A search engine to help you find things you don't know about. gnod stands for The Global Network of Dreams, and is a test of artificial intelligence. Building a database from the user choices, it helps you find books, music and misc. other by having you enter in things that you like, and based on what other people like, it shows you stuff you ought to like, too (which is slightly different from what Amazon does, showing you what other people have bought). Don't know if all the Amazon Associate links detract from it all or not
posted by crunchland on Aug 30, 2002 - 25 comments

The Covers Project is compiling a list of covers, in hopes of creating "chains" ie: Band covered Song by Artist who covered OtherSong by OtherArtist, etc. Also see prevous thread about Musical Sausage. Unfortunately, that link now redirects to the Grand Royal on-line store, for some reason.
posted by Su on Apr 16, 2002 - 28 comments

Wondering when and where your favorite band is playing? Musi-cal is sort of the Internet Concert Database; a collaborative scheduling information site. To make it even cooler, it runs the Insanely Great™ Zope.
posted by baylink on Oct 5, 2000 - 0 comments