PBS
Pbs: Elements of Music: Exploring the Composer's Tools
This online lesson will help students understand how composers write music by engaging in a project which culminates in their own compositions.
Other
Creating Music
This online, interactive environment for music creation and exploration includes games and puzzles and interesting activities that teach about music in a visual way.
Other
Part 13: In 900 Minutes, You Can Be Composing
Learn how to compose music in 900 minutes through a process known as "Improvitaping." This is a good tool for the upper level student and makes a great teachers help.