Have you checked out About.com online? It has lots of “neighborhoods” featuring information about all sorts of interests, and one of them is music education. Started in 1996, About.com has been run since 2005 by the New York Times company.
The music education site presents information and resources on music theory, history of music, profiles of musicians and composers, online music games, and lesson plans. Every week a newletter is emailed to those who sign up, with links to their articles about specific topics within each of these areas–spotlights on certain performers or composers from various musical genres, lesson plans, a free music resource of the week involving songs, links and downloads; timely series built around, for example, Women’s History Month, Jazz Appreciation Month, and Black History Month. There are ideas about practicing, buying instruments, history timelines, etc.
Apart from the music education site, the larger site, about.com also has “neighborhoods” devoted specifically to folk music, classical, guitar, top 40/pop music, and children’s music. You can also sign up to receive weekly emails with highlights and links for any of these topics.
