question

i just have a quick question
there is a song called Equus by Blonde Redhead that im curious about
it the song Equus and the story Equus the related?
i havent seen the movie yet, because i want to read the play first so i cant answer this myself
if ya'll arent Blonde Redhead fans i'll post the lyrics here:

Allow me to show you
The way which I adore you

Sometimes I think I must
Just let you be a horse
All I want is to be a rider
To be part of you

Afraid so afraid
To lose you
If someone looks at you
Turn into donkey
Pretend you are lame

Equus by nature
Timid creature
Ready to run away
Equus by nature
Timid creature
Cares nothing
For the plans they made

I will hide you
Will protect you
Won’t let anyone
Take you away

so if anyone knows anything i'd greatly appreciate it
thanx =]