First thing you heard when you play Bioshock Infinite 1 (rapture) its the dying scream from Songbird, from Bioshock Infinite. They asked the creator about this, he just laughed he couldnt deny it. Thats why i got the chills when i heard it, it felt like a deja vu.
You will see, before you leave the elevator bubble, at the moment its opening, before getting to rapture, you will heard that painful scream.
You will hear it near 6:44 , you will hear the sound of the door but at the same time you will hear the songbird.
That was just genius, not only the bioshock infinite connects to the one, but also backwards.
Cant wait for the new dlc Burial at Sea of rapture and Elizabeth.