/usr/lib/libxmmsclient++-glib.so is in libxmmsclient++-glib-dev 0.8+dfsg-12.
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