adding-the-current-date-to-a-score.ly blanking-staff-lines-using-the--whiteout-command.ly center-text-below-hairpin-dynamics.ly changing-properties-for-individual-grobs.ly clusters.ly coloring-notes-depending-on-their-pitch.ly creating-a-sequence-of-notes-on-various-pitches.ly embedding-native-postscript-in-a--markup-block.ly generating-random-notes.ly generating-whole-scores-also-book-parts-in-scheme-without-using-the-parser.ly making-some-staff-lines-thicker-than-the-others.ly non-traditional-key-signatures.ly printing-music-with-different-time-signatures.ly using-postscript-to-generate-special-note-head-shapes.ly