Music theory students and teachers can benefit from additional learning from online resources. Today's student is used to interactivity and multimedia, and these music websites can help augment the usual classroom fair, whether you are teaching elementary music or basic theory for college freshman. Most of these theory websites provide user-friendly lessons with colorful illustrations, and a few even provide online exercises.  Musical U Musical U is an online community that provides ear training and music theory expertise, detailed lesson plans, examples, free practice audio, and more.  Ricci Adam's Music Theory.Net Ricci Adam's Music Theory.net is my favorite online music website. Not only does the online music site provide lessons in everything from basic intervals to Neapolitan chords, there are also a large number of exercises. Additional utilities include a chord calculator and a matrix calculator for serialism lessons. Additionally, there are basic exercis...