This element is recommended where the MEI file is a transcription of existing music, but is not required when the data is originally created in MEI form.
<elementSpec ident="sourceDesc" module="MEI.header">
<desc>(source description) – A container for the descriptions of the source(s) used in the
creation of the electronic file.</desc>
<content>
</content>
<remarks>
<p>This element is recommended where the MEI file is a transcription of existing music,
but is
not required when the data is originally created in MEI form.</p>
</remarks>
</elementSpec>