I know why the caged bird sings response

What I think that this poem means is that the caged bird sings of freedom because singing of freedom is as close to freedom as it will get. The caged bird is trapped in the cage for the rest of its life, so it sings. The caged bird will never truly be free because its wings are clipped, so even if it is set free it can't fly. Its wings are a permanent reminder that it was once trapped in a cage with nothing to do but sing.