creating-blank-staves.ly forcing-rehearsal-marks-to-start-from-a-given-letter-or-number.ly changing-the-appearance-of-a-slur-from-solid-to-dotted-or-dashed.ly coloring-objects.ly changing-the-default-text-font-family.ly changing-a-single-notes-size-in-a-chord.ly three-sided-box.ly clefs-commonly-tweaked-properties.ly blanking-staff-lines-using-the--whiteout-command.ly applying-notehead-styles-depending-on-the-step-of-the-scale.ly