The answer to your problem is 2/3
While I was walking to the store I passed a thrift shop
I need the passage to answer sorry I can't comment on your question either so sorry
But a caged bird stands on the grave of dreams
his shadow shouts on a nightmare scream
his wings are clipped and his feet are tied
so he opens his throat to sing
Paraphrased:
A caged bird's dreams are dead, killed by its captivity. It is tied down and restricted and so cannot do much else. It shouts a maniacal scream (for help? in anguish?). Since it is physically limited, all it can do is use its voice to sing.
Steinbeck was receive an award of noble prize :)
