Tabular evaluation of major search engines. Selective and annotated listing of a variety of types of directories and search engines. A generic guide to assist in evaluating the scope, structure, use, and relevance of search tools. Links to other pages offer additional information, including search strategy tips. These site listings are selected and maintained by the search services.
None are comprehensive.
Most are weighted toward popular music and the music industry, which seem to represent the largest number of web sites. You will find many commercial sites and sites created by individuals as well as research and educational sites.