Melanie Amaro
She sings "Desperado". It starts out beautifully, but for some reason the arrangment has been changed to make the last half sound more like a Gospel song. Melanie carries it well though.
For the performance: 
For almost butchering an Eagles song: 
L.A.: Nice song choice.
Nicole: There is no limit to what you and your voice can do.
Paula: You look beautiful. Your voice is like fine china, only brought out for the best occasions.
Simon: We never cleared that song before, so it was touch and go. I never realized how good you are! You are the one to beat, trust me.