In ABC notation, inline notation of key and time signature changes in the middle of a song using [] does not convert correctly to MusicXML.

[tsugumi]

music21 version

9.1.0

Problem summary

Converting a score written in ABC notation to MusicXML may result in incorrect MusicXML output.

Steps to reproduce

ABC notation source

X:1
L:1/8
M:6/8
K:C#
c B A G |[K:Cb][M:3/8] F/ E/ D/ |] 

Music21 code fragment

score = converter.parse(abc_string, format='abc')       
score.write('musicxml', output_file)   

Expected vs. actual behavior

Expected

Actual

More information

X:1
L:1/8
M:6/8
K:C#
c B A G |\
K:Cb
M:3/8
F/ E/ D/ |]

is OK.