Apps similar to Handel include MusicJargon, which is free and open source. Other options are abc notation and Alda. In total there are three Music Production Apps like Handel for Mac, Windows, Linux, the web and self-hosting.
MusicJargon is a high level musical notation that allows to represent aurally perceived music played with instruments or sung by the human voice through the use of text files.
abc is a text based format for music notation, particularly popular for folk and traditional music.
Alda is a text-based programming language for music composition. It allows you to write and play back music using only a text editor and the command line.
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