Music Stage Ending: She sings a death metal diss song about you and the stage blows up, knocking her off the stage to her death. Wire Ending: She betrays the player and tries attacking him/her and falls to her death.
If you chose the Music Stage Ending, then Bessie runs to the stage, betrays you, and sings a diss song about what you have done so far. Put on your Invisibility Cloak, and Bessie will ask where you have gone. There is a pyrotechnic bar in front of you, put the wrong pyrotechnic on, and the stage will explode, knocking Bessie off. She has died. Then, run to the nearest room, where the explosion won't get to you.