So, interesting discovery I just made. "Caliban's Dream" is based on "Dawn of Eden" from Frankenstein, as its foundation. If you listen carefully to the choral part in the background (for example, from 2:10 to 2:40), and to the soprano part (Esme's singing, starting at 4:18 and again at 6:34), it matches "Dawn of Eden".
Elizabeth Roberts, Esme, and Rick
Esme and Elizabeth