From d47ce0609dfca0ce3bca4c81a63d53262efa2051 Mon Sep 17 00:00:00 2001
From: Jacob Walls <jacobtylerwalls@gmail.com>
Date: Wed, 9 Mar 2022 08:59:02 -0500
Subject: [PATCH 1/3] Remove title and author defaults

Avoid writing empty tags for movement-title and creator
---
 music21/defaults.py          |  4 ++--
 music21/musicxml/m21ToXml.py | 17 +++++++++--------
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/music21/defaults.py b/music21/defaults.py
index 4f55198a96..ec2830d63d 100644
--- a/music21/defaults.py
+++ b/music21/defaults.py
@@ -31,8 +31,8 @@ class DefaultsException(Exception):
     pass
 
 
-title = 'Music21 Fragment'
-author = 'Music21'
+title = ''
+author = ''
 software = 'music21 v.' + _version.__version__  # used in xml encoding source software
 musicxmlVersion = '3.1'
 
diff --git a/music21/musicxml/m21ToXml.py b/music21/musicxml/m21ToXml.py
index c8ae1f2fbe..114ee977fc 100644
--- a/music21/musicxml/m21ToXml.py
+++ b/music21/musicxml/m21ToXml.py
@@ -352,9 +352,7 @@ def parse(self, obj=None):
           PUBLIC "-//Recordare//DTD MusicXML ... Partwise//EN"
           "http://www.musicxml.org/dtds/partwise.dtd">
         <score-partwise version="...">
-          <movement-title>Music21 Fragment</movement-title>
           <identification>
-            <creator type="composer">Music21</creator>
             <encoding>
               <encoding-date>...</encoding-date>
               <software>music21 v...</software>
@@ -2198,7 +2196,6 @@ def setIdentification(self):
         >>> mxIdentification = SX.setIdentification()
         >>> SX.dump(mxIdentification)
         <identification>
-          <creator type="composer">Music21</creator>
           <encoding>
             <encoding-date>20...-...-...</encoding-date>
             <software>music21 v...</software>
@@ -2243,7 +2240,7 @@ def setIdentification(self):
                 mxId.append(mxCreator)
                 foundOne = True
 
-        if foundOne is False:
+        if foundOne is False and defaults.author:
             mxCreator = SubElement(mxId, 'creator')
             mxCreator.set('type', 'composer')
             mxCreator.text = defaults.author
@@ -2421,14 +2418,18 @@ def setTitles(self):
 
         # musicxml often defaults to show only movement title
         # if no movement title is found, get the .title attr
-        mxMovementTitle = SubElement(mxScoreHeader, 'movement-title')
+        movement_title = ''
         if mdObj.movementName not in (None, ''):
-            mxMovementTitle.text = str(mdObj.movementName)
+            movement_title = str(mdObj.movementName)
         else:  # it is none
             if mdObj.title is not None:
-                mxMovementTitle.text = str(mdObj.title)
+                movement_title = str(mdObj.title)
+            elif defaults.title:
+                movement_title = defaults.title
             else:
-                mxMovementTitle.text = defaults.title
+                return
+        mxMovementTitle = SubElement(mxScoreHeader, 'movement-title')
+        mxMovementTitle.text = movement_title
 
     def contributorToXmlCreator(self, c):
         # noinspection SpellCheckingInspection, PyShadowingNames

From ae2f64f4f695c6fd877112a980b6aa3947a9a2a6 Mon Sep 17 00:00:00 2001
From: Jacob Walls <jacobtylerwalls@gmail.com>
Date: Wed, 9 Mar 2022 09:21:48 -0500
Subject: [PATCH 2/3] Add coverage

---
 music21/musicxml/m21ToXml.py | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/music21/musicxml/m21ToXml.py b/music21/musicxml/m21ToXml.py
index 114ee977fc..e79b62e75d 100644
--- a/music21/musicxml/m21ToXml.py
+++ b/music21/musicxml/m21ToXml.py
@@ -2225,6 +2225,21 @@ def setIdentification(self):
           </encoding>
         </identification>
 
+
+        Overriding the default:
+
+        >>> defaults.author = "Batch Conversion March 2022"
+        >>> SX = musicxml.m21ToXml.ScoreExporter()
+        >>> mxIdentification = SX.setIdentification()
+        >>> SX.dump(mxIdentification)
+        <identification>
+          <creator type="composer">Batch Conversion March 2022</creator>
+          <encoding>
+            <encoding-date>20...-...-...</encoding-date>
+            <software>music21 v...</software>
+          </encoding>
+        </identification>
+
         '''
         if self.mxIdentification is not None:
             mxId = self.mxIdentification

From 1fcd51885963e992f3058b261ae82311c6546179 Mon Sep 17 00:00:00 2001
From: Jacob Walls <jacobtylerwalls@gmail.com>
Date: Tue, 19 Apr 2022 18:35:27 -0400
Subject: [PATCH 3/3] Restore defaults

---
 music21/defaults.py          | 4 ++--
 music21/musicxml/m21ToXml.py | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/music21/defaults.py b/music21/defaults.py
index ec2830d63d..4f55198a96 100644
--- a/music21/defaults.py
+++ b/music21/defaults.py
@@ -31,8 +31,8 @@ class DefaultsException(Exception):
     pass
 
 
-title = ''
-author = ''
+title = 'Music21 Fragment'
+author = 'Music21'
 software = 'music21 v.' + _version.__version__  # used in xml encoding source software
 musicxmlVersion = '3.1'
 
diff --git a/music21/musicxml/m21ToXml.py b/music21/musicxml/m21ToXml.py
index e79b62e75d..c8ebf209bc 100644
--- a/music21/musicxml/m21ToXml.py
+++ b/music21/musicxml/m21ToXml.py
@@ -352,7 +352,9 @@ def parse(self, obj=None):
           PUBLIC "-//Recordare//DTD MusicXML ... Partwise//EN"
           "http://www.musicxml.org/dtds/partwise.dtd">
         <score-partwise version="...">
+          <movement-title>Music21 Fragment</movement-title>
           <identification>
+            <creator type="composer">Music21</creator>
             <encoding>
               <encoding-date>...</encoding-date>
               <software>music21 v...</software>
@@ -2196,6 +2198,7 @@ def setIdentification(self):
         >>> mxIdentification = SX.setIdentification()
         >>> SX.dump(mxIdentification)
         <identification>
+          <creator type="composer">Music21</creator>
           <encoding>
             <encoding-date>20...-...-...</encoding-date>
             <software>music21 v...</software>