Sky trumpets or the Trumpets of the imminent apocalypse.
The strange sky trumpets were recorded in Singapore, Budapest and California. What's going on?
Strange sounds heard in Singapore at night on January 13, 2016
Strange sound from the sky on January 9, 2016, in Budapest, Hungary
Strange noises from the sky in Bakersville, California on January 8, 2016
These sounds are all different. And this makes me think they are legit. But of course you decide. And why are they increasing these days along with loud booms?
What I hear are distinct notes, varying only in intensity.
The 3 different places where the sounds are heard are 3 different notes on a musical scale.