Bonnie is dying. Charlie asks her the code to the signal jammer, but Desmond doesn't believe she will divulge it. Charlie reminds her that Ben ordered her death and she could get revenge by betraying him.
She starts saying the number sequence, and Charlie asks her to slow down so he can write it. Instead of repeating the numbers, she tells him the sequence plays "Good Vibrations". A musician programmed it.
The title refers to the code Charlie must enter to stop the jamming device.