Northern Arizona University
Northern Arizona University: Sojurn: Anatomy of a Fugue
A wonderful site with detailed descriptions of most of the aspects of a fugue, including some examples. The article gets very technical so a background in music theory would be helpful before exploring this site.
BBC
Bbc: Music Theory
This resource presents a fun and interactive way to learn all about the elements of music. It offers links to information, definitions, assessments, and examples of melody, harmony and tonality, structure, tempo, metre and rhythm,...
Northern Arizona University
Northern Arizona University: Sojurn: How to Analyze a Fugue
This page is very helpful in analyzing and understanding fugues. Great site for music theory students and teachers.