/usr/lib/x86_64-linux-gnu/libWildMidi.so is in libwildmidi-dev 0.2.3.4-2.1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libWildMidi.so.1.0.2
/usr/lib/x86_64-linux-gnu/libWildMidi.so.1.0.2