This, in my opinion, is an amazing song. The contrast of voices between Emeli Sandé and Professor Green is brilliant, his rap sounds straight from the heart, his anger clear in both tone of voice and lyrics. Emeli Sandé sings the chorus (if chorus is the right word) in an incredible voice. She is the perfect counterpoint to Greens rap, her voice soft yet powerful, combined with the lyrics she sings, makes for a beautiful mix.
I have also listened to the remix's, but do not think they are anywhere near close to the original. They hold none of the emotion so rife in the original.
I would recommend this song to anybody who loves music as it is a brilliant example of music at it's best. The lyrics are incredible, as is the way the song is arranged.