Here I am 45 minutes after watching the vid you posted still watching a capella group vids on YouTube.
Have no fear, I have found a solution to getting back those YouTube hours wasted on a capella groups... A DeLorean and 1.21 gigawatts!!
Seriously, Youtube is the devil!!! I just burned my entire lunch watching acapella vids!! A couple night ago, I blew two and a half hours watching train derailment videos!! DAMN YOU YOUTUUUBE!!!!