No Autotune, just a guitar and herself. I dont hear one off note, and shes playing live with no effect.

whats the main difference here, one girl is singing in a home, and one in front of a z-100 sign. One girl has perfect pitch, the other..doesnt. One girl has no mic, the other a radio broadcast mic feed, and dont sound as good.

https://www.youtube.com/watch?v=YqeW-blaKjM
https://www.youtube.com/watch?v=QUa0pVDGuYA