lilypond-essay: Ledger lines

 
 Ledger lines
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 Ledger lines present a typographical challenge: they make it more
 difficult to space musical symbols close together and they must be clear
 enough to identify the pitch at a glance.  In the example below, we see
 that ledger lines should be thicker than normal staff lines and that an
 expert engraver will shorten a ledger line to allow closer spacing with
 accidentals.  We have included this feature in LilyPond’s engraving.
 
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