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In MusicXML, a clef with no number is for staff 1, not for all staves in a part #1905

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In MusicXML, a clef with no number is for staff 1, not for all staves in a part #1905

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a0df6a4
In MusicXML, a clef with no number is for staff 1, not for all staves…
gregchapman-dev May 31, 2026
295864a
Fix doctest (0: is the default, 1: is the clef being tested).
gregchapman-dev May 31, 2026
d8a2f4d
Slightly improved doctest.
gregchapman-dev May 31, 2026
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13 changes: 11 additions & 2 deletions music21/musicxml/xmlToM21.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2556,6 +2556,11 @@ def getStaffNumber(mxObjectOrNumber) -> int:
pass
except AttributeError: # a normal number
pass
if mxObject.tag in ('staff-layout',
'staff-details',
'clef'):
# for this subset of number'ed tags, no number means staff 1
return 1
return NO_STAFF_ASSIGNED
else:
return NO_STAFF_ASSIGNED
Expand Down Expand Up @@ -6011,13 +6016,17 @@ def handleClef(self, mxClef):

>>> MP = musicxml.xmlToM21.MeasureParser()
>>> MP.handleClef(mxClef)
>>> MP.lastClefs
{0: <music21.clef.TrebleClef>}
>>> MP.lastClefs[1]
<music21.clef.TrebleClef>
>>> MP.lastClefs[0]
<music21.clef.TrebleClef>

>>> mxClefBC = ET.fromstring('<clef number="2"><sign>F</sign><line>4</line></clef>')
>>> MP.handleClef(mxClefBC)
>>> MP.lastClefs[2]
<music21.clef.BassClef>
>>> MP.lastClefs[1]
<music21.clef.TrebleClef>
>>> MP.lastClefs[0]
<music21.clef.TrebleClef>
'''
Expand Down
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