/usr/ is in libfluidsynth-dev 1.1.6-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/doc/
/usr/share/doc/libfluidsynth-dev/
/usr/share/doc/libfluidsynth-dev/examples/
/usr/share/doc/libfluidsynth-dev/examples/example.c
/usr/share/doc/libfluidsynth-dev/copyright
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/fluidsynth.pc
/usr/include/
/usr/include/fluidsynth/
/usr/include/fluidsynth/ramsfont.h
/usr/include/fluidsynth/audio.h
/usr/include/fluidsynth/midi.h
/usr/include/fluidsynth/gen.h
/usr/include/fluidsynth/seqbind.h
/usr/include/fluidsynth/log.h
/usr/include/fluidsynth/synth.h
/usr/include/fluidsynth/settings.h
/usr/include/fluidsynth/types.h
/usr/include/fluidsynth/event.h
/usr/include/fluidsynth/shell.h
/usr/include/fluidsynth/seq.h
/usr/include/fluidsynth/misc.h
/usr/include/fluidsynth/voice.h
/usr/include/fluidsynth/mod.h
/usr/include/fluidsynth/version.h
/usr/include/fluidsynth/sfont.h
/usr/include/fluidsynth.h
/usr/share/doc/libfluidsynth-dev/changelog.Debian.gz
/usr/lib/x86_64-linux-gnu/libfluidsynth.so