udev (userspace /dev) is a device manager for the Linux kernel. As the successor of devfsd and hotplug, udev primarily manages device nodes in the /dev directory. At the same time, udev also handles all user space events raised when hardware devices are added into the system or removed from it, including firmware loading as required by certain devices. (https://en.wikipedia.org/wiki/Udev)

/etc/udev/rules.d/90-usbdrive-music.rules

KERNEL=="sd*", ENV{ID_FS_UUID}=="FC1ADF421ADEF89A", RUN+="/usr/bin/logger --tag my-manual-usb-mount Mounting the device with UUID FC1ADF421ADEF89A", RUN+="/usr/bin/systemd-mount --no-block --automount=yes --collect --owner=leopardb $devnode /home/leopardb/Music"

service udev restart needed…