Principles of Orchestration online course by Nikolay Rimsky Korsakov orchestration - Garritan Interactive

Hookpad is a free web app that simplifies songwriting by helping you choose chords that sound good together and guiding you to write a good melody. It's a musical sketchpad with music theory "built-in" to make it easier and more intuitive to find the sound you're looking for.

EarSketch teaches computer science through music composition and remixing! No prior knowledge of either computer science or music is needed. See “More About EarSketch” below to learn more about the software.