> Coloured note heads are better at conveying pitch than note shapes - which are already used in percussion notation.
Shape notes are used in singing traditions such as Sacred Harp and Christian Harmony to help singers find the right pitch. It works very well. I don't know if anyone uses them for instrumental music.
Shape notes are used in singing traditions such as Sacred Harp and Christian Harmony to help singers find the right pitch. It works very well. I don't know if anyone uses them for instrumental music.
https://en.wikipedia.org/wiki/Shape_note