This first one is particularly bad... don't know who this guy is, but


I don't know - perhaps just sing the harmonies yourself,


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This next one, is good old Kenny G using ReaPitch to do a similar thing - if you listen to his base track at 0.40 - then it's at least doubled, maybe tripled, already - strikes me that's not the way to generate USEFUL harmonies artificially - perhaps a single track would be better, anyway, what he's done is create additional "harmonies" at a constant 4 steps and 7 steps up using ReaPitch, and the end result is the god-awful noise presented at 3.20 - again, that is a completely artificial sounding mess and also has the additional problem in that THIS IS NOT HOW HARMONY WORKS as I understand it.
He thinks he's created a major triad harmony, but he hasn't, because if, say, you start with a C and your song is in C major, and you strike a major third up, that's E and then a fifth up that's G - all good so far. But if the next note in your melody is D, then his auto harmony is now producing F# and A and that F# isn't in the key of C major, so it's dissonant if you're trying to sing a song that's in C major. So perhaps a useful effect, but a useful harmony it ain't. Very few people have noted this issue in the comments - most think it's a fantastic thing. Another 70,000 people have seen this video.
It's almost like he knows everything about Reaper but not much about music theory. Or have I missed something and my general understanding of music is incorrect?