Whilst in Chicago you could hear this noise particularly in the evenings which I grew to love (the only way I can describe it is like a circular saw). As you go from the east coast to the west coast you hear them less and less. LA you don’t hear them at all. The cicada is a small bug that lives in the trees which sing at night to avoid predators and are surprisingly loud for such a small critter click here for more info. I tried to record the sound. What sounds like a circular saw is a cicada, the rushing sound is the CTA trains you can here going at super speed. The housing and streets are of Chicago around where I stayed. (all the streets are beautiful and very similar).