Piano
- Getting Started as a Beginner.
- Practicing for the absolute beginner - Where and how to start playing the piano.
- Synthesia - A fun way to learn how to play the piano.
- How to Play Piano - Learn Pop Songs on the Piano in 5 Minutes.
- Beginner Piano - Master keyboard fundamentals by learning popular tunes from "the best piano teacher in London".
- Getting Started with Music Theory. More lessons and a great tool. If you're in a hurry, check How Music Works.
- In the academic side, Intro Theory by Dmiti Tymoczko. His course works on a much more fundamental level than any other music theory course.
- Study Music is a great GitHub repo with lots of music theory resources.