Thanks from me as well, Bargle for starting this thread.
This makes me wonder as have many of the headphone pictures if he didn't use acoustics as a weapon. Sure, the girls look seemingly relaxed in some of the pictures, but what gives with the headphones? That coupled with the helmet and the girl with the hat on while naked? Something is up with that I think.
Sorry, to hijak. Just thinking out loud. Also, who developed all these photographs? Did Alcala have a dark room? I have a link although it's about war it explains music as torture.
http://www.sibetrans.com/trans/trans10/cusick_eng.htm
This woman should be so easy to identify one would think. She's to me stunningly beautiful. Sadly she's on that da*n blue matress thingie. So sad.