According to Wikepedia The Brood X cicada contains three species, Magicicada septendecim ,Magicicada cassinii and Magicicada septendecula, that congregate on different trees and have different male songs.[5]
Here are examples of each so you can listen for what's around you.
Magicicada Septendecim, that sound like they're calling from an alien world
Magicicada Septendecula , that remind me of grass hoppers
Magicicada cassinii, these guys sound like they're running from something that's trying to eat them...