Bioshock Infinite Music Hidden in Ambient Noise

In some parts of the game, you can hear what sounds like some long groaning and other noises that just sound like ambient noise. If you speed up the sound, you can hear a mix of singing, and there s definitely some guitar action going on. At 800 speed, it sounds like a man singing softly with guitar in the background. At 1000 speed, it sounds like a woman singing. I scrubbed through a few hours of recorded footage to try to find some more, but it seems to be just this one song. It happens i