Below are two previously posted versions: one in Am, one in Em. Myself, I play it in Em as I believe Mr. Ronson does on the original recording. I personally tend to favor the second version, but thanks go out to the original posters of both :-) On the record, one guitars play the chords, while another plays the riff . It's a bit trickier to try and capture the whole thing on one guitar, but I play the E chord first, leave the top two strings ringing while I start the riff, but when I get (azchords.com)