I’m a beginner pianist, and I’ve been writing down stuff in ABC notation[1] using Obsidian[2] and a plugin[3] for instant previews. I was already using Obsidian for all of my plain-text Markdown notes, so it was the obvious choice for me. Obsidian also has a nice WYSIWYG-preserving PDF export feature in case I need some printed sheets. :)
ABC is easier to learn but also not feature rich. ABC vs Lilypond is similar to asciiMath vs MathJax in this aspect. You'll soon find its limitation and needs more.
(But Lilypond is hard, harder than writing documents in LaTeX for example.)
- [1]: https://abcnotation.com
- [2]: https://obsidian.md
- [3]: https://github.com/abcjs-music/obsidian-plugin-abcjs