Music theory websites
- https://www.musictheory.net/lessons
- https://teoria.com/
- https://daveconservatoire.org/?welcome=true
- https://tobyrush.com/theorypages/pdf/en-us/the-whole-enchilada-set.pdf
- https://www.khanacademy.org/partner-content/all-star-orchestra/music-basics/elements-of-music/v/lesson-1-note-values-duration-and-time-signatures