5.1.2 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 or showFirstLength properties 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.

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