/usr/lib/x86_64-linux-gnu/grilo-0.2/grl-magnatune.xml is in grilo-plugins-0.2 0.2.12-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | <plugin>
<info>
<name>Magnatune</name>
<module>libgrlmagnatune</module>
<description>A plugin for searching music</description>
<author>Victor Toso</author>
<license>LGPL</license>
<site>https://wiki.gnome.org/Projects/Grilo</site>
</info>
</plugin>
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