ReleaseNotes_3.0.0.txt

Changes since 2.0.1:

Require music21 v9 (for several features/fixes)

Add MEI exporter.  It exports MEI v5 by default, but can be asked to export MEI v4.
    - MEI export is feature-equivalent with MEI import.

MEI import improvements:
    - import MEI v4 and v5 (obeying mei@meiversion)
    - refactor to share code with MEI exporter and have instance-based state
    - handle nested beams (i.e. grace note beams within another beam group)
    - fermata placement (above, below)
    - fix some clef bugs
    - handle rest positioning (@oloc/@ploc)
    - fix some octave/Ottava bugs
    - fix some gestural duration bugs (including some bugs in tuplets)
    - fix @dots.ges handling
    - add @dur.ppq handling
    - fix activeMeter tracking
    - pad layer with spaces if it is shorter than the longest layer in any staff in the measure
    - fix handling of missing note@oct/note@oct.ges
    - handle missing tuplet@num and tuplet@numbase (default num=3, numbase=2)
    - allPartNs now only contains the staffs defined in the initial scoreDef (instead
        of all the staffDefs in the score)
    - allow first scoreDef to be inside first section
    - better handling of scoreDef keysig/timesig vs staffDef (and vs missing staffDef)
    - better handling of measure@left (ignore it more)
    - better handling of repeat starts
    - support ending "numbers" that are non-numeric
    - support @unitdur in tremolos (bTrem/fTrem)
    - fix bug when there are grace notes within a tuplet
    - add @dur.default handling, and rework @dur/@dur.ges/mRest/mSpace/maxBarDuration handling
    - better handling of missing @staff
    - handle verse@label just like <verse><label>
    - handle ties much more accurately, including chord@tie
    - stop making up measure numbers
    - support unpitched notes, fix percussion clefs, staff lines != 5
    - support placement of articulations (e.g. staccato)
    - support hairpin with @startid, @endid, or both
    - support dir/dynam/tempo with @startid instead of @tstamp
    - generate music21 StaffGroups (and PartStaffs if appropriate)
    - support tuplet display details
    - import of metadata

Humdrum export improvements:
    - support ornaments
    - support ottavas
    - fix export of tuplets, including carefully choosing non-power-of-two recip
    - support tuplet display details (*{X}tuplet/*{X}brackettup)
    - fix export of articulations with placement

Humdrum import/export improvements:
    - support center justification
    - tweaks to systemdecoration/StaffGroup code, now shared with MEI import/export
    - some metadata fixes

Improvements to all importers/exporters:
    - support ornament accidentals (I implemented this in music21 v9)
    - support page and system breaks
    - improve ottava support (I improved Ottava support in music21 v9)
    - support delayed turns (I implemented this in music21 v9)