First, I suggest Cadillac Records to anyone who hasn't seen it. Even though it may, for all I know, contain much that is apocryphal, or at least wildly inaccurate, it was still good entertainment. There is about one minute of Rolling Stones in the movie. The bassist (I'm assuming Wyman) is playing some gi-normous thing. Can anyone identify the instrument he was using, either from seeing the movie, or the likely instrument from that time, for the band?