MuseScore

MuseScore is the world's leading free and open-source software for writing and sharing music, with a user-friendly interface and immensely powerful features. It is free to install on Windows, Mac, and Linux (MuseScore does not run on IOS or Android devices).

I use MuseScore to prepare lessons for my students.  These lessons can be accessed from a student's private page on this website (see the Directory page).

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MuseScore Download Page

MuseScore.org