Re: musicXML: 2 voices in 1 measurement

[Hans Aikema]

On 22 Sep 2021, at 23:05, Ivanov Dmitry <usr345@gmail.com> wrote:

I am trying to create a musicXML file with 2 voices:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE score-partwise PUBLIC
   "-//Recordare//DTD MusicXML 4.0 Partwise//EN"
   "http://www.musicxml.org/dtds/partwise.dtd">
<score-partwise version="4.0">
 <part-list>
   <score-part id="P1">
     <part-name>Music</part-name>
   </score-part>
 </part-list>
 <part id="P1">
   <measure number="1">
     <attributes>
       <divisions>1</divisions>
       <key>
         <fifths>1</fifths>
       </key>
       <time>
         <beats>4</beats>
         <beat-type>4</beat-type>
       </time>
       <clef>
         <sign>G</sign>
         <line>2</line>
       </clef>
     </attributes>
     <note>
       <voice>1</voice>
       <pitch>
         <step>F</step>
         <alter>1</alter>
         <octave>4</octave>
       </pitch>
       <duration>2</duration>
       <type>half</type>
     </note>
     <note>
       <pitch>
         <step>G</step>
         <alter>0</alter>
         <octave>4</octave>
       </pitch>
       <voice>1</voice>
       <duration>2</duration>
       <type>half</type>
     </note>
     <note>
       <pitch>
         <step>C</step>
         <alter>0</alter>
         <octave>4</octave>
       </pitch>
       <voice>2</voice>
       <duration>2</duration>
       <type>half</type>
     </note>
     <note>
       <pitch>
         <step>A</step>
         <alter>0</alter>
         <octave>3</octave>
       </pitch>
       <voice>2</voice>
       <duration>2</duration>
       <type>half</type>
     </note>
   </measure>
 </part>
</score-partwise>

It seems ok to me: the notes are in the same measure. But when I use
musicxml2ly and then lilypond I get the second voice shifted to the
next measurement. What is wrong?

<score.png>

Every note in musicxml moves the time-pointer forward, so your musicxml represents two voices that follow eachother. To make them parallel you need to <backup> a full measure before the notes of voice 2 to reset the time-pointer to the start of the measure.

https://www.w3.org/2021/06/musicxml40/musicxml-reference/elements/backup/