Um, this is incredible and amazing and basically every word in the dictionary that is a synonym of the word fantastic!
Srsly, this is the craziest talent we've ever seen OR heard!
Here is Anna-Maria Hefele who is demonstrating how she can sing two notes at the same time.
Two notes. At the same freaking time!! Mariah Carey is one of the most talented vocalists in the world and we don't even think she can do that!
This is going to blow your mind.
Watch Anna as she demonstrates singing two notes at once (below)!!