I already knew this girl was talented, but in my normal youtube wanderings, I came across a bunch of different covers of all different kinds of artists that Ailee did, and man....she is a vocal goddess!!
Whitney Houston - I Have Nothing
Frozen - Let It Go
2NE1 - Lonely
Rihanna - Umbrella
Alicia Keys - No One
She has tons and tons of cover songs so I really can't list them all, but let's just say it now...