Video one is a known fake. The fact that you haven't taken the 2 seconds to research this is mind boggling.
Video two is either fake (sounds really fake) or the real phenomenon of acoustic gravity waves. They're generated where the ionosphere meets the atmosphere. Again, take the 2 seconds to do a goggle search and educate yourself.
Video 3 is the same as video 2.
More about acoustic gravity waves;
STRANGE SOUNDS IN SKY EXPLAINED BY SCIENTISTS
Saturday, 28 January 2012
09:17
"Mr. Khalilov, what is the nature of the unusual very low-pitched sounds reported by a great number of people in different parts of the planet since the summer of 2011?"
"Many call them "The Sound of the Apocalypse".Information about that comes from all over the world: US, UK, Costa Rica,Russia, Czech Republic, Australia, etc. We have analyzed records of these sounds and found that most of their spectrum lies within the infrasound range, i.e. is not audible to humans. What people hear is only a small fraction of the actual power of these sounds. They are low-frequency acoustic emissions in the range between 20 and 100 Hz modulated by ultra-low infrasonic waves from 0.1 to 15 Hz. In geophysics, they are called acoustic-gravity waves; they are formed in the upper atmosphere, at the atmosphere-ionosphere boundary in particular. There can be quite a lot of causes why those waves are generated: earthquakes,volcanic eruptions, hurricanes, storms, tsunamis, etc. However, the scale ofthe observed humming sound in terms of both the area covered and its power far exceeds those that can be generated by the above-mentioned phenomena.
In that case, what could be causing this humming in the sky?
"In our opinion, the source of such powerful and immense manifestation of acoustic-gravity waves must be very large-scale energy processes. These processes include powerful solar flares and huge energy flows generated by them, rushing towards Earth's surface and destabilizing the magnetosphere,ionosphere and upper atmosphere. Thus, the effects of powerful solar flares:the impact of shock waves in the solar wind, streams of corpuscles and bursts of electromagnetic radiation are the main causes of generation of acoustic-gravitation waves following increased solar activity."