Hi...I am very interested in how sound works from the 'human perception' side of it. I want to know how different sounds and harmonics interact...for example, two noises making 50dB of sound each, we do not hear 100dB of sound, yet it is more than 50. I want to know how our ears and mind work together to perceive different sounds. I wish I could ask more specific questions, but I'm just looking for resources. ANY would be appreciated.