LilyPond is a music engraving program that aims to produce high-quality sheet music with the aesthetics of traditionally engraved music. It is free software as part of the GNU Project, offering a powerful and flexible tool for various engraving tasks including classical music, complex notation, early music, modern music, tablature, vocal music, lead sheets, educational materials, large orchestral projects, customized output, and even Schenker graphs. The program provides beautiful sheet music examples, such as those by J.S. Bach, to inspire users. LilyPond is a unique and versatile tool for musicians looking to create professional-looking sheet music.
https://lilypond.org/