/usr/share/doc/libmusicbrainz5-2/changelog.Debian.gz is in libmusicbrainz5-2 5.1.0+git20150707-5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libmusicbrainz5-2/../libmusicbrainz5cc2v5/changelog.Debian.gz