A little lesson about sound. The videos where you couldn't hear the vocals in were probably shot like this.
---------------------------PA Level
---------------------------Amp Level
---------------------------ELEVATED STAGE/Handicam Level (not multi-thousand dollar live recording systems your overly synthesized generic bands are provided)
---------------------------Ground level
Basically when your camera mic is 20 feet away from an 800 watt ampeg bass stack displacing the air like crazy, and a 200 watt Marshall stacking beating it with high end frequencies, especially in a small bar where the acoustics aren't very good to begin with, you aren't going to hear much of anything but fuzz and distortion. Even in the video
YouTube - hot cross at the wnd 04
where the camera is elevated where the PA's would be, it is still hard to hear the vocals, just because of how much sound is bouncing off those walls. Your ears may be focused to hear things directly in front of you and to the sides (not to mention much better at processing sound waves), but a MUCH more sensitive mic that can't take tons of sound without overloading is going to really take a beating from all the frequencies bouncing around that room.
PS. God, you are both idiots.