I tried to imitate the "Who's Joe?" intro melody with my synthesizer. I used a Rhodes MkII patch, with a slight tremolo effect, a little bit of distortion, and some reverb. It comes pretty close to the sound, although it's not as natural sounding. I'm willing to bet NO used a real Rhodes in the studio. Here's an mp3 file of what I did:
http://www.onetransmission.com/mp3/who's%20joe%20intro.mp3
also, here's another mp3 sample i posted earlier with a bell-like Rhodes piano sound:
http://www.platinumloops.co.uk/demos/keyboard_samples/rhodesriffseven140b.wav