Pharell Williams/Pamola Faith 'I just cant rely on you'

[DTermination]

Hiya guys iv'e been listening to this Paloma Faith track entitled 'I just cant rely on you' produced by Pharell Williams. Ive been tryna work out what key its in. I think it might be B Major but not to sure as I can hear an A note played in the riff and a D note in the brass chords.

let me know what you think heres the link

Paloma Faith - Can't Rely on You - YouTube