Okay, so on this one I'm with Chrissy. But as for the mystery...
Okay, so while I do think the who was meant to be implied, I think I agree with Myles that I prefer to stick to one POV within a single sentence. My creative writing books all say it's bad form to shift POV within a single scene, much less one sentence so I would do anything to avoid that shift. Then again, it is just a song...
I can't stand the one that goes "Insane in the membrane / Insane in the brain." It makes me foam at the mouth every time, screaming to DH that a membrane is absolutely not in any way shape or form the same thing as a brain, and it's not possible for a membrane to lose its sanity. I can't bear it.
DH and I love to laugh at the Black Sabbath song that goes
Generals gathered their masses
Just like witches at black masses
We can't decide if it's brilliance or sheer laziness to rhyme homonyms.

I wish you luck with the Celexa. I know all these appointments are hard for you.