Issues

• MusicXML import doesn't read <midi-instrument> changes in <sound>

  cuthbertLab/music21#2085 · Filter by author bramtayl opened on Oct 13, 2026
  4

• MusicXML import drops piano-family MIDI programs when the instrument name isn't recognized

  cuthbertLab/music21#2084 · Filter by author bramtayl opened on Oct 13, 2026

• MusicXML <segno/> in a <barline> isn't read, so expandRepeats() fails

  cuthbertLab/music21#2083 · Filter by author bramtayl opened on Oct 13, 2026

• MusicXML <transpose> with <octave-change> but no <diatonic> raises TypeError

  cuthbertLab/music21#2082 · Filter by author bramtayl opened on Oct 13, 2026

• toSoundingPitch() transposes key signatures by the MIDI program's instrument instead of the part's <transpose>

  cuthbertLab/music21#2081 · Filter by author bramtayl opened on Oct 13, 2026

• MusicXML import ignores <sound tempo> when the direction also has a <metronome>

  cuthbertLab/music21#2080 · Filter by author bramtayl opened on Oct 13, 2026

• MusicXML import ignores jumps written as <sound> attributes

  cuthbertLab/music21#2079 · Filter by author bramtayl opened on Oct 13, 2026

• TypeError in ChordReducer.run() on multi-part stream.Score without instrument partIds

  cuthbertLab/music21#2074 · Filter by author wysiwys opened on Oct 9, 2026

• Accidental's .client is never set, so Pitch (and from there Note) is never informed of alter changes

  cuthbertLab/music21#2063 · Filter by author mscuthbert opened on Oct 7, 2026

• chordToXml sorts a copy of the chord and discards it

  cuthbertLab/music21#2055 · Filter by author float3 opened on Oct 2, 2026
  3

• MIDI import: makeTies()/makeMeasures() permanently desyncs later note offsets by whole bars when simultaneous notes of different length collide

  cuthbertLab/music21#2020 · Filter by author JackyChanMusic opened on Sep 1, 2026
  2

• Slur bezier-x/y from start element gets overwritten by stop element's values

  cuthbertLab/music21#2019 · Filter by author adam1xz opened on Aug 31, 2026
  3

• Discussion/Proposal: Pitches always have accidentals

  cuthbertLab/music21#2010 · Filter by author mscuthbert opened on Aug 24, 2026
  5

• Discussion/Proposal: StreamCore to Stream.core

  cuthbertLab/music21#2008 · Filter by author mscuthbert opened on Aug 24, 2026
  3

• Humdrum: section-structured kern file parses to 8 of 69 measures (silent truncation)

  cuthbertLab/music21#1987 · Filter by author jpsmith8488 opened on Jul 22, 2026
  1

• Keyboard braille: extractHeading passes a KeySignature where a TimeSignature is expected (isinstance tested on the container)

  cuthbertLab/music21#1986 · Filter by author jpsmith8488 opened on Jul 22, 2026
  1

• Keyboard braille: a measure wider than one line aborts the whole transcription (no measure division, unlike the single-part path)

  cuthbertLab/music21#1985 · Filter by author jpsmith8488 opened on Jul 22, 2026
  1

• Split dotGroups to its own subclass

  enhancement
  cuthbertLab/music21#1969 · Filter by author mscuthbert opened on Jul 1, 2026

• chordSymbolFigureFromChord fails to identify RomanNumeral with sus4 or 7sus4 figures (missing 5th)

  cuthbertLab/music21#1866 · Filter by author dszeto opened on Feb 27, 2026
  4

• Make measures in incomplete parts either in MIDI parsing or MusicXML export

  enhancement
  cuthbertLab/music21#1857 · Filter by author jacobtylerwalls opened on Jan 25, 2026
  

• MIDI import only detects overlaps from same start time (rather than same end time also)

  cuthbertLab/music21#1856 · Filter by author palpatim opened on Jan 19, 2026
  4

• Tuplet and Parenthesis Handling Issues in ABC converter (abcFormat)

  cuthbertLab/music21#1798 · Filter by author guang-yng opened on Jun 21, 2025

• Jupyter notebook midi player doesn't recognize MetronomeMark

  cuthbertLab/music21#1784 · Filter by author oxygen-dioxide opened on May 26, 2025
  7

• music21.midi.MidiEvent.getBytes() confuses SEQUENCER_SPECIFIC_META_EVENT (0x7F) with POLY_MODE_ON (also 0x7F)

  cuthbertLab/music21#1772 · Filter by author ptolemeow opened on May 6, 2025
  1

• Feature request: .getOffsetBySiteInSeconds in Music21Object

  enhancement
  cuthbertLab/music21#1771 · Filter by author oxygen-dioxide opened on Apr 29, 2025
  3