Genres - Ken Davies has grouped resources in five categories: classical, folk/ethnic/world, jazz, musicals/operas/theater, and pop/rock/country.
Meta Description: [ An annotated guide to music resources in style and genre catagories. ]

A Taxonomy of Musical Genres - Two French experts re-define genres to improve musical databases for electronic distribution, paper submitted to a conference in Paris in 2000.

AllMusic Guide: Genres - Musical style sort with detailed definitions from site maintained by musical journalists. Requires free registration.

American Music Center: Musical Genres - Links to articles and representative artists of styles such as pop, rock, blues, folk, classical, theater, jazz, and world music.

Audiogalaxy: Glossary of Musical Styles - Hundreds of sub-genres defined in non-technical language mentioning sample artists. Organized under headings such as pop, hip-hop, jazz, blues, classical, Latin, modern rock, rock, and heavy metal.

Christian Music Place: Artists by Genre - About two dozen musical genres including blues, a capella, dance/techno, and Southern gospel, with as many as several hundred links to Christian music artists in each.

DataDragon: Music Genre Sampler - Children's site with simple definitions of a few genres including rock, Celtic, and classical with artist and site links.
Meta Description: [ Learn about different musical genres including rock, Celtic, classical, and more all with artist and site links. ]

Duke University Library: Women in Music By Musical Genre - Text lists and links to library resources such as books, periodicals and recordings on women performers and composers by musical genre.

Ectophiles Guide by Genre - Self-described Guide to Good Music from a group founded in 1991 to support the music of singer Happy Rhodes. Links to artists, almost entirely female vocalists, sorted by genre such as pop, blues, experimental, performance art, beautiful and fierce, and traditional.
Meta Description: [ The Guide is a comprehensive database of musical artists and groups as seen through the comments and reviews of the ectophiles. ]

Indiana University School of Music: Genres - Categorized links organized by researchers at the William and Gayle Cook Music Library. Unusual categories include 20th-Century music, ancient music, band music, tango, flamenco, ragtime, and choral music.

InfoUSA: Musical Genres - Links organized by genre such as blues and jazz, classical and opera, folk and country, and early American music.

Music Classification by Genre: System Performance - Research project completed in 2003 by Mitali Banerjee at Rice University used automatic process to determine musical genre of audio samples.

Representing Musical Genre: A State of the Art - Journal of New Music Research article from 2003 discusses manual, prescriptive, and emergent approaches to genre classification for the European CUIDADO project, Content-Based Unified Interfaces and Descriptors for Audio/Music Databases Available Online.

Wikipedia: Musical Genre - Brief explanation of the way styles can be defined by region, chronology, technical requirements, marketing trends, or the ideas of critics. Extensively linked to sub-genres and examples of significant artists.