New features in 2.20 since 2.18
*******************************

   * A new flexible template suitable for a range of choral music, is
     now provided.  This may be used to create simple choral music,
     with or without piano accompaniment, in two or four staves. Unlike
     other templates, this template is `built-in', which means it does
     not need to be copied and edited: instead it is simply `\include''d
     in the input file.  For details, see *note Built-in templates:
     (lilypond-learning)Built-in templates.

   * The positioning of tuplet numbers for kneed beams has been
     significantly improved.  Previously, tuplet numbers were placed
     according to the position of the tuplet bracket, even if it was
     not printed.  This could lead to stranded tuplet numbers.  Now
     they are now positioned closer to the kneed-beam when an
     appropriate beam segment exists for its placement and when the the
     bracket is not drawn.

     Collision detection is also added, offsetting horizontally if too
     close to an adjoining note column but preserving the number's
     vertical distance from the kneed beam.  If the number itself is
     too large to fit in the available space the original,
     bracket-based, positioning system is used instead; and in the
     event of a collision (e.g. with an accidental) the tuplet number
     is moved vertically away instead.

          \time 3/4
          \override Beam.auto-knee-gap = 3
          \tuplet 3/2 4 {
            g8 c'' e,
            c'8 g,, e''
            g,,8 e''' c,,
          }
           [image of music]


     The original kneed-beam tuplet behavior is still available through
     an `\override' via a new, `knee-to-beam' property.

          \time 3/4
          \override Beam.auto-knee-gap = 3
          \override TupletNumber.knee-to-beam = ##f
          \tuplet 3/2 4 {
            g8 c'' e,
            c'8 g,, e''
            g,,8 e''' c,,
          }
           [image of music]


   * `\lyricsto' and `\addLyrics' have been `harmonized'.  Both now
     accept the same kind of delimited argument list that `\lyrics' and
     `\chords' accept.  Backward compatibility has been added so music
     identifiers (i.e. `\mus') are permitted as arguments.  A
     `convert-ly' rule has been added that removes redundant uses of
     `\lyricmode' and rearranges combinations with context starters such
     that `\lyricsto' in general is applied last (i.e. like
     `\lyricmode' would be).

   * Scheme functions and identifiers can now be used as output
     definitions.

   * Scheme expressions can now be used as chord constituents.

   * Improved visual spacing of small and regular `MI' Funk and Walker
     noteheads so they are now the same width as other shaped notes in
     their respective sets.  `SOL' noteheads are also now visually
     improved when used with both the normal Aiken and Sacred Harp
     heads, as well as with the thin variants.

   * `LeftEdge' now has a definable `Y-extent' (i.e.vertical).  See *note
     LeftEdge: (lilypond-internals)LeftEdge.

   * Added a new `make-path-stencil' function that supports all `path'
     commands both relative and absolute:

     `lineto', `rlineto', `curveto', `rcurveto', `moveto', `rmoveto',
     `closepath'.  The function also supports `single-letter' syntax
     used in standard SVG path commands:

     `L', `l', `C', `c', `M', `m', `Z' and `z'.  The new command is
     also backward-compatible with the original
     `make-connected-path-stencil' function.  Also see
     `scm/stencil.scm'.

   * Context properties named in the `alternativeRestores' property are
     restored to their value at the start of the _first_ alternative in
     all subsequent alternatives.

     Currently the default set restores `current meter';

          \time 3/4
          \repeat volta 2 { c2 e4 | }
          \alternative {
            { \time 4/4 f2 d | }
            { f2 d4 | }
          }
          g2. |
           [image of music]


     `measure position';

          \time 3/4
          \repeat volta 2 { c2 e4 | }
          \alternative {
            { \time 4/4
              \set Timing.measurePosition = #(ly:make-moment -1/2)
              f2 | }
            { f2 d4 | }
          }
          g2. |
           [image of music]


     and `chord changes';

          <<
            \new ChordNames {
              \set chordChanges = ##t
              \chordmode { c1:m d:m c:m d:m }
            }
            \new Staff {
              \repeat volta 2 { \chordmode { c1:m } }
              \alternative {
                { \chordmode { d:m } }
                { \chordmode { c:m } }
              }
            \chordmode { d:m }
          }
          >>
           [image of music]


   * Improved MIDI output for breathe marks.  After tied notes, breaths
     take time _only_ from the last note of the tie; e.g.  `{ c4~ c8
     \breathe }' performs as `{ c4~ c16 r }' instead of `{ c4 r8 }'.
     This is more consistent with articulations and how humans
     interpret breaths after ties.  It now also makes it easier to
     align simultaneous breathe marks over multiple parts, all with
     different note lengths.

   * A new note head style for Tabulature has been added;
     `TabNoteHead.style = #'slash'.

   * Four new Clefs have been added.  _Double G_, _Tenor G_,
     _Varpercussion_ and _varC_.

            \override Staff.Clef.full-size-change = ##t

            \clef "GG" c c c c
            \clef "tenorG" c c c c
            \clef "varC" c c c c
            \clef "varpercussion" c c c c

            \break
            \override Staff.Clef.full-size-change = ##f

            \clef "GG" c c c c
            \clef "tenorG" c c c c
            \clef "varC" c c c c
            \clef "varpercussion" c c c c
           [image of music]


   * Isolated durations in music sequences now stand for unpitched
     notes.  This may be useful for specifying rhythms to music or
     scheme functions.  When encountered in the final score, the
     pitches are provided by the preceding note or chord.  Here are two
     examples where this makes for readable input:

          \new DrumStaff \with { \override StaffSymbol.line-count = 1 }
          \drummode {
            \time 3/4
            tambourine 8 \tuplet 3/2 { 16 16 16 }
                       8 \tuplet 3/2 { 16 16 16 } 8 8 |
          }
           [image of music]


          \new Staff { r16 c'16 ~ 8 ~ 4 ~ 2 | }
           [image of music]


   * Beaming exceptions can now be constructed using the
     `\beamExceptions' scheme function.  One can now write

          \time #'(2 1) 3/16
          \set Timing.beamExceptions =
            \beamExceptions { 32[ 32] 32[ 32] 32[ 32] }
          c16 c c |
          \repeat unfold 6 { c32 } |
           [image of music]


     with multiple exceptions separated with `|' bar checks (writing
     the exception pattern without pitches is convenient but not
     mandatory).  Previously, setting the beam exceptions would have
     required writing

     \set Timing.beamExceptions =
     #'(                         ;start of alist
        (end .                   ;entry for end of beams
         (                       ;start of alist of end points
          ((1 . 32) . (2 2 2))   ;rule for 1/32 beams -- end each 1/16
         )))

   * The most common articulations are now reflected in MIDI output.
     Accent and marcato make notes louder; staccato, staccatissimo and
     portato make them shorter. Breath marks shorten the previous note.

     This behavior is customizable through the `midiLength' and
     `midiExtraVelocity' properties on `ArticulationEvent'.  See
     `script-init.ly' for examples.

   * The PostScript functionality of stroke adjustment is no longer
     applied automatically but left to the discretion of the PostScript
     device (by default, Ghostscript uses it for resolutions up to
     150dpi when generating raster images).  When it is enabled, a more
     complex drawing algorithm designed to benefit from stroke
     adjustment is employed mostly for stems and bar lines.

     Stroke adjustment can be forced by specifying the command line
     option `-dstrokeadjust' to LilyPond.  When generating `PDF' files,
     this will usually result in markedly better looking `PDF' previews
     but significantly larger file size.  Print quality at high
     resolutions will be unaffected.




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