Okay, I still don't know what a bock is. There is a pretty catchy tune about it though lol.

Black Bock

https://www.youtube.com/watch?v=jih29bmwOSY

Edit: Figured I should post the lyric, although it offers no enlightenment.

I cut the throat of the billy goat and let it bleed
His frozen eyes were far more than I
It's kind of nice to know the things that make me happy
Just realize keep the dog away from me
I found it don't matter when
It's not nice to feel alone inside
This little goat won't mind
All my fear are just vanishing
And the blood will let me find a way
Will open heaven
Down in here all my dreams are filled
Good and bad they seem to be the same
And never lonely
If I just let this power in
It will work it will make me feel O.K.
Be sure forever