/usr/lib/libxmmsclient-glib.so is in libxmmsclient-glib-dev 0.8+dfsg-9.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libxmmsclient-glib.so.1.0.0
/usr/lib/libxmmsclient-glib.so.1.0.0