Let's listen to it:
The Main Riff is built around a I-IV-Progression in the key of A major and uses chord tones (root and third) and connecting approach notes.
Except for the Interlude (Part F) the whole song is built around this funky Riff, so it's an easy and quick song to learn, only make sure that you groove the hell out of that riff!
Here's the full transcription:
When played live Joss Stone has the song transposed to G major, as you can hear in this following videoclip:
More Joss Stone transcriptions:
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