The MIDI Basics page from TweakHeads Electronic Musicians Cafe. Has a good overview of MIDI, but also a sidebar to information on many other music technologies.

This channel is designed to provide musicians with information on using Cakewalk Software Products for music production and creation

Welcome to the 8notes.com online Music Theory course. 46 Lessons introducing you to the most important concepts of music theory.

eMusicTheory.com provides online tools for teachers and students of basic music theory, everywhere.

Internet for Music is a free online tutorial to help university students develop their Internet research skills.Learn how to make discerning use of the Internet to help find information for your coursework and assignments.

Aquallegro is a great way to improve your musical ability. It contains quizzes on various aspects of music, as well as detailed help files with tips and mnemonics. All of the quizzes are scored while in progress, so the user continuously knows how well they're doing, and it is easy to customize Aquallegro so it works the way you want it to. It also contains Administrative features for teachers, making it an excellent tool in any music program. Aquallegro is perfect for the comprehensive music student or just for the curious that want to hone their musical skills. With a price of $0, how could...

GarageBand '09 video tutorials