Follow this link to for an introduction to music theory on the Open University's OpenLearn site. This 8-hour course takes you through basic concepts of western music notation and music theory and is pitched at a level equivalent to Grades 1-3 of the Associated Board of the Royal Schools of Music theory exams.
The module provides preparatory material for students embarking on A224, but also stands on its own as an introductory course for anyone who would like to learn the fundamentals of reading music.