Typesetting existing music - GNU LilyPond
Description: GNU LilyPond

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### 4.2 Typesetting existing music

If you are entering music from an existing score (i.e., typesetting a piece of existing sheet music),

- Enter one manuscript (the physical copy) system at a time (but still only one bar per line of text), and check each system when you finish it. You may use the `showLastLength` command to speed up processing – see Skipping corrected music.
- Define `mBreak = { \break }` and insert `\mBreak` in the input file whenever the manuscript has a line break. This makes it much easier to compare the LilyPond music to the original music. When you are finished proofreading your score, you may define `mBreak = { }` to remove all those line breaks. This will allow LilyPond to place line breaks wherever it feels are best.

This page is for LilyPond-2.8.8 (stable-branch).

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