Video 1: Can't decide.
Video 2: To me sounds like In Dark trees by Brian Eno.
video 3: Sounds like city noises to me.
Video 4:Traffic noises.
Video 5: Engine sounds, maybe a diesel truck or propeller sounds.
Video 6: No unusual sounds at all.
Video 7: Nothing unusual other than the sound of someone possibly chocking their chiuaua.
Video 8: Sounds like an electric motor. Near a bridge, power station maybe?
Video 9: Sounds like a plane or a shitty microphone recording a shitty truck.
Video 10: Regular Sky sounds.
Video 11: No sounds at all.

Im not even going to continue. I think with the age of information, people just don't listen to the world anymore. There are definitively strange things happenings, these just aren't one of em.