Howto Setup Grub2 Bootloader with Star Wars theme song at init startup

Just edit the file /etc/default/grub
GRUB_DEFAULT=2
GRUB_TIMEOUT=666
GRUB_INIT_TUNE="480 440 4 440 4 440 4 349 3 523 1 440 4 349 3 523 1 440 8 659 4 659 4 659 4 698 3 523 1 415 4 349 3 523 1 440 8"
then run
grub-mkconfig -o /boot/grub/grub.cfg
or
grub-update && restart
Enjoy the force ;)