Yes, and I am getting slightly better results by now.
But the results are very mixed and far from perfect.
I now mostly get images from artists (performers), and only sometimes from the composer.
So it doesn't seem to strictly source from the 'composer' tag?
(and when it indeed shows the composer, it sometimes will still be a photograph of a statue of him, but that might be more difficult to avoid)
Are there other settings or tagging aspects this is depending on that might be influencing the results?
(I'd hate the culprit of this strictly being on my side)
This is the xml I am using to test this:
<?xml version="1.0" encoding="utf-8"?>
<settings enableScaling="true" />
<element type="Gallery" x="100" y="100" width="600" height="300" aspectRatio="zoomKeep" interval="31" tags="artist" artistType="composer"></element>
Never mind, I'm no longer pursuing this.