The files are categorized by their first two digits with the following meaning:
@itemize
-@item 00 ... Basic notes notation (pitches, durations, accidentals, etc.)
+@item 00 ... Basics: Pitches, durations, rests, clefs, keys, time sigs, ties, etc.
@item 01 ... Chords
-@item 02 ... Articulations, Ornaments, Technicals
+@item 02 ... Articulations, Ornaments, Technicals, Texts
@item 03 ... Dynamics (single symbols, not spanners like hairpins)
@item 04 ... Spanners (hairpins, octave shifts, trills, etc.)
@item 05 ... Header information (title, composer, poet, etc.)
@item 06 ... Lyrics
-@item 07 ... Clefs, keys, upbeats
@item 08 ... Multiple parts (staves)
-@item 09 ... Repeats, barlines
+@item 09 ... Measure issues: Repeats, barlines, pickup measures, mid-measure barlines/repeats
@item 10 ... Multiple voices per staff
-@item 11 ... Rests (durations, pitched rests, etc.)
@item 12 ... Triplets, Tuplets
@item 13 ... Grace notes
@item 14 ... Multi-staff parts (one voice on multiple staves, e.g. PianoStaff)
@item 15 ... Percussion
+@item 17 ... Guitar notation: Chord names, Fretboards, Tablature notation
+@item 19 ... Page layout: font/paper size, margins, spacing
+@item 20 ...
@end itemize
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