The first video we watched, mother of all funk chords, was amazing because I didn't think that each of the people who appear in the video is playing different songs. It is still hard to believe the song is consisted of may different songs because it is too perfectly blended.
http://www.youtube.com/watch?v=tprMEs-zfQA

The second video we watched is made by putting many videos of different people singing the same song, Angels on the Moon. The first one was much better than the second one because in the second one, each person's singing level, the tone, and the speed of singing are different.
http://www.youtube.com/watch?v=tjY3UvQ2n98