InnerStaffGroup -> StaffGroup, InnerChoirStaff -> ChoirStaff")
def conv (str):
str = re.sub (r'systemSeparatorMarkup', r'system-separator-markup', str)
InnerStaffGroup -> StaffGroup, InnerChoirStaff -> ChoirStaff")
def conv (str):
str = re.sub (r'systemSeparatorMarkup', r'system-separator-markup', str)